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C语言经典100例(二) <转>2006-01-21 13:51:00

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<适合初学者>
【文章正文】
 【程序50】
题目:#include 的应用练习   
1.程序分析:
2.程序源代码:
test.h 文件如下:
#define LAG >
#define SMA <
#define EQ ==
#include "test.h" /*一个新文件50.c,包含test.h*/
#include "stdio.h"
void main()
{ int i=10;
int j=20;
if(i LAG j)
printf("\40: %d larger than %d \n",i,j);
else if(i EQ j)
printf("\40: %d equal to %d \n",i,j);
else if(i SMA j)
printf("\40:%d smaller than %d \n",i,j);
else
printf("\40: No such value.\n");
}

【程序51】
题目:学习使用按位与 & 。   
1.程序分析:0&0=0; 0&1=0; 1&0=0; 1&1=1
2.程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=077;
b=a&3;
printf("\40: The a & b(decimal) is %d \n",b);
b&=7;
printf("\40: The a & b(decimal) is %d \n",b);
}
==============================================================
【程序52】
题目:学习使用按位或 | 。
1.程序分析:0|0=0; 0|1=1; 1|0=1; 1|1=1            
2.程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=077;
b=a|3;
printf("\40: The a & b(decimal) is %d \n",b);
b|=7;
printf("\40: The a & b(decimal) is %d \n",b);
}
==============================================================
【程序53】
题目:学习使用按位异或 ^ 。   
1.程序分析:0^0=0; 0^1=1; 1^0=1; 1^1=0
2.程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=077;
b=a^3;
printf("\40: The a & b(decimal) is %d \n",b);
b^=7;
printf("\40: The a & b(decimal) is %d \n",b);
}
==============================================================
【程序54】
题目:取一个整数a从右端开始的4~7位。
程序分析:可以这样考虑:
(1)先使a右移4位。
(2)设置一个低4位全为1,其余全为0的数。可用~(~0<<4)
(3)将上面二者进行&运算。
2.程序源代码:
main()
{
unsigned a,b,c,d;
scanf("%o",&a);
b=a>>4;
c=~(~0<<4);
d=b&c;
printf("%o\n%o\n",a,d);
}
==============================================================
【程序55】
题目:学习使用按位取反~。   
1.程序分析:~0=1; ~1=0;
2.程序源代码:
#include "stdio.h"
main()
{
int a,b;
a=234;
b=~a;
printf("\40: The a's 1 complement(decimal) is %d \n",b);
a=~a;
printf("\40: The a's 1 complement(hexidecimal) is %x \n",a);
}
==============================================================
【程序56】
题目:画图,学用circle画圆形。   
1.程序分析:
2.程序源代码:
/*circle*/
#include "graphics.h"
main()
{int driver,mode,i;
float j=1,k=1;
driver=VGA;mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(YELLOW);
for(i=0;i<=25;i++)
{
setcolor(8);
circle(310,250,k);
k=k+j;
j=j+0.3;
}
}
==============================================================
【程序57】
题目:画图,学用line画直线。
1.程序分析:           
2.程序源代码:
#include "graphics.h"
main()
{int driver,mode,i;
float x0,y0,y1,x1;
float j=12,k;
driver=VGA;mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(GREEN);
x0=263;y0=263;y1=275;x1=275;
for(i=0;i<=18;i++)
{
setcolor(5);
line(x0,y0,x0,y1);
x0=x0-5;
y0=y0-5;
x1=x1+5;
y1=y1+5;
j=j+10;
}
x0=263;y1=275;y0=263;
for(i=0;i<=20;i++)
{
setcolor(5);
line(x0,y0,x0,y1);
x0=x0+5;
y0=y0+5;
y1=y1-5;
}
}
==============================================================
【程序58】
题目:画图,学用rectangle画方形。   
1.程序分析:利用for循环控制100-999个数,每个数分解出个位,十位,百位。
2.程序源代码:
#include "graphics.h"
main()
{int x0,y0,y1,x1,driver,mode,i;
driver=VGA;mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(YELLOW);
x0=263;y0=263;y1=275;x1=275;
for(i=0;i<=18;i++)
{
setcolor(1);
rectangle(x0,y0,x1,y1);
x0=x0-5;
y0=y0-5;
x1=x1+5;
y1=y1+5;
}
settextstyle(DEFAULT_FONT,HORIZ_DIR,2);
outtextxy(150,40,"How beautiful it is!");
line(130,60,480,60);
setcolor(2);
circle(269,269,137);
}
==============================================================
【程序59】
题目:画图,综合例子。
1.程序分析:
2.程序源代码:
# define PAI 3.1415926
# define B 0.809
# include "graphics.h"
#include "math.h"
main()
{
int i,j,k,x0,y0,x,y,driver,mode;
float a;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
x0=150;y0=100;
circle(x0,y0,10);
circle(x0,y0,20);
circle(x0,y0,50);
for(i=0;i<16;i++)
{
 a=(2*PAI/16)*i;
 x=ceil(x0+48*cos(a));
 y=ceil(y0+48*sin(a)*B);
 setcolor(2); line(x0,y0,x,y);}
setcolor(3);circle(x0,y0,60);
/* Make 0 time normal size letters */
settextstyle(DEFAULT_FONT,HORIZ_DIR,0);
outtextxy(10,170,"press a key");
getch();
setfillstyle(HATCH_FILL,YELLOW);
floodfill(202,100,WHITE);
getch();
for(k=0;k<=500;k++)
{
 setcolor(3);
 for(i=0;i<=16;i++)
 {
  a=(2*PAI/16)*i+(2*PAI/180)*k;
  x=ceil(x0+48*cos(a));
  y=ceil(y0+48+sin(a)*B);
  setcolor(2); line(x0,y0,x,y);
 }
 for(j=1;j<=50;j++)
 {
  a=(2*PAI/16)*i+(2*PAI/180)*k-1;
  x=ceil(x0+48*cos(a));
  y=ceil(y0+48*sin(a)*B);
  line(x0,y0,x,y);
 }
}
restorecrtmode();
}
==============================================================
【程序60】
题目:画图,综合例子。   
1.程序分析:
2.程序源代码:
#include "graphics.h"
#define LEFT 0
#define TOP 0
#define RIGHT 639
#define BOTTOM 479
#define LINES 400
#define MAXCOLOR 15
main()
{
int driver,mode,error;
int x1,y1;
int x2,y2;
int dx1,dy1,dx2,dy2,i=1;
int count=0;
int color=0;
driver=VGA;
mode=VGAHI;
initgraph(&driver,&mode,"");
x1=x2=y1=y2=10;
dx1=dy1=2;
dx2=dy2=3;
while(!kbhit())
{
 line(x1,y1,x2,y2);
 x1+=dx1;y1+=dy1;
 x2+=dx2;y2+dy2;
 if(x1<=LEFT||x1>=RIGHT)
 dx1=-dx1;
 if(y1<=TOP||y1>=BOTTOM)
  dy1=-dy1;
 if(x2<=LEFT||x2>=RIGHT)
  dx2=-dx2;
 if(y2<=TOP||y2>=BOTTOM)
  dy2=-dy2;
 if(++count>LINES)
 {
  setcolor(color);
  color=(color>=MAXCOLOR)?0:++color;
 }
}
closegraph();
}

【程序61】
题目:打印出杨辉三角形(要求打印出10行如下图)   
1.程序分析:
       1
      1  1
      1  2  1
      1  3  3  1
      1  4  6  4  1
      1  5  10 10 5  1 
2.程序源代码:
main()
{int i,j;
int a[10][10];
printf("\n");
for(i=0;i<10;i++)
 {a[i][0]=1;
 a[i][i]=1;}
for(i=2;i<10;i++)
 for(j=1;j a[i][j]=a[i-1][j-1]+a[i-1][j];
for(i=0;i<10;i++)
 {for(j=0;j<=i;j++)
 printf("%5d",a[i][j]);
 printf("\n");
 }
}
==============================================================
【程序62】
题目:学习putpixel画点。
1.程序分析:            
2.程序源代码:
#include "stdio.h"
#include "graphics.h"
main()
{
int i,j,driver=VGA,mode=VGAHI;
initgraph(&driver,&mode,"");
setbkcolor(YELLOW);
for(i=50;i<=230;i+=20)
 for(j=50;j<=230;j++)
 putpixel(i,j,1);
for(j=50;j<=230;j+=20)
 for(i=50;i<=230;i++)
 putpixel(i,j,1);
}
==============================================================
【程序63】
题目:画椭圆ellipse   
1.程序分析:
2.程序源代码:
#include "stdio.h"
#include "graphics.h"
#include "conio.h"
main()
{
int x=360,y=160,driver=VGA,mode=VGAHI;
int num=20,i;
int top,bottom;
initgraph(&driver,&mode,"");
top=y-30;
bottom=y-30;
for(i=0;i{
ellipse(250,250,0,360,top,bottom);
top-=5;
bottom+=5;
}
getch();
}
==============================================================
【程序64】
题目:利用ellipse and rectangle 画图。
1.程序分析:
2.程序源代码:
#include "stdio.h"
#include "graphics.h"
#include "conio.h"
main()
{
int driver=VGA,mode=VGAHI;
int i,num=15,top=50;
int left=20,right=50;
initgraph(&driver,&mode,"");
for(i=0;i{
ellipse(250,250,0,360,right,left);
ellipse(250,250,0,360,20,top);
rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2));
right+=5;
left+=5;
top+=10;
}
getch();
}
==============================================================
【程序65】
题目:一个最优美的图案。   
1.程序分析:
2.程序源代码:
#include "graphics.h"
#include "math.h"
#include "dos.h"
#include "conio.h"
#include "stdlib.h"
#include "stdio.h"
#include "stdarg.h"
#define MAXPTS 15
#define PI 3.1415926
struct PTS {
int x,y;
};
double AspectRatio=0.85;
void LineToDemo(void)
{
struct viewporttype vp;
struct PTS points[MAXPTS];
int i, j, h, w, xcenter, ycenter;
int radius, angle, step;
double rads;
printf(" MoveTo / LineTo Demonstration" );
getviewsettings( &vp );
h = vp.bottom - vp.top;
w = vp.right - vp.left;
xcenter = w / 2; /* Determine the center of circle */
ycenter = h / 2;
radius = (h - 30) / (AspectRatio * 2);
step = 360 / MAXPTS; /* Determine # of increments */
angle = 0; /* Begin at zero degrees */
for( i=0 ; irads = (double)angle * PI / 180.0; /* Convert angle to radians */
points[i].x = xcenter + (int)( cos(rads) * radius );
points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio );
angle += step; /* Move to next increment */
}
circle( xcenter, ycenter, radius ); /* Draw bounding circle */
for( i=0 ; ifor( j=i ; jmoveto(points[i].x, points[i].y); /* Move to beginning of cord */
lineto(points[j].x, points[j].y); /* Draw the cord */
} } }
main()
{int driver,mode;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
LineToDemo();}
==============================================================
【程序66】
题目:输入3个数a,b,c,按大小顺序输出。   
1.程序分析:利用指针方法。
2.程序源代码:
/*pointer*/
main()
{
int n1,n2,n3;
int *pointer1,*pointer2,*pointer3;
printf("please input 3 number:n1,n2,n3:");
scanf("%d,%d,%d",&n1,&n2,&n3);
pointer1=&n1;
pointer2=&n2;
pointer3=&n3;
if(n1>n2) swap(pointer1,pointer2);
if(n1>n3) swap(pointer1,pointer3);
if(n2>n3) swap(pointer2,pointer3);
printf("the sorted numbers are:%d,%d,%d\n",n1,n2,n3);
}
swap(p1,p2)
int *p1,*p2;
{int p;
p=*p1;*p1=*p2;*p2=p;
}
==============================================================
【程序67】
题目:输入数组,最大的与第一个元素交换,最小的与最后一个元素交换,输出数组。
1.程序分析:谭浩强的书中答案有问题。      
2.程序源代码:
main()
{
int number[10];
input(number);
max_min(number);
output(number);
}
input(number)
int number[10];
{int i;
for(i=0;i<9;i++)
 scanf("%d,",&number[i]);
 scanf("%d",&number[9]);
}
max_min(array)
int array[10];
{int *max,*min,k,l;
int *p,*arr_end;
arr_end=array+10;
max=min=array;
for(p=array+1;p if(*p>*max) max=p;
 else if(*p<*min) min=p;
 k=*max;
 l=*min;
 *p=array[0];array[0]=l;l=*p;
 *p=array[9];array[9]=k;k=*p;
 return;
}
output(array)
int array[10];
{ int *p;
for(p=array;p printf("%d,",*p);
printf("%d\n",array[9]);
}
==============================================================
【程序68】
题目:有n个整数,使其前面各数顺序向后移m个位置,最后m个数变成最前面的m个数
1.程序分析:
2.程序源代码:
main()
{
int number[20],n,m,i;
printf("the total numbers is:");
scanf("%d",&n);
printf("back m:");
scanf("%d",&m);
for(i=0;i scanf("%d,",&number[i]);
scanf("%d",&number[n-1]);
move(number,n,m);
for(i=0;i printf("%d,",number[i]);
printf("%d",number[n-1]);
}
move(array,n,m)
int n,m,array[20];
{
int *p,array_end;
array_end=*(array+n-1);
for(p=array+n-1;p>array;p--)
 *p=*(p-1);
 *array=array_end;
 m--;
 if(m>0) move(array,n,m);
}
==============================================================
【程序69】
题目:有n个人围成一圈,顺序排号。从第一个人开始报数(从1到3报数),凡报到3的人退出
   圈子,问最后留下的是原来第几号的那位。
1. 程序分析:
2.程序源代码:
#define nmax 50
main()
{
int i,k,m,n,num[nmax],*p;
printf("please input the total of numbers:");
scanf("%d",&n);
p=num;
for(i=0;i *(p+i)=i+1;
 i=0;
 k=0;
 m=0;
 while(m {
 if(*(p+i)!=0) k++;
 if(k==3)
 { *(p+i)=0;
 k=0;
 m++;
 }
i++;
if(i==n) i=0;
}
while(*p==0) p++;
printf("%d is left\n",*p);
}
==============================================================
【程序70】
题目:写一个函数,求一个字符串的长度,在main函数中输入字符串,并输出其长度。   
1.程序分析:
2.程序源代码:
main()
{
int len;
char *str[20];
printf("please input a string:\n");
scanf("%s",str);
len=length(str);
printf("the string has %d characters.",len);
}
length(p)
char *p;
{
int n;
n=0;
while(*p!='\0')
{
 n++;
 p++;
}
return n;
}

【程序71】
题目:编写input()和output()函数输入,输出5个学生的数据记录。
1.程序分析:
2.程序源代码:
#define N 5
struct student
{ char num[6];
 char name[8];
 int score[4];
} stu[N];
input(stu)
struct student stu[];
{ int i,j;
 for(i=0;i { printf("\n please input %d of %d\n",i+1,N);
  printf("num: ");
  scanf("%s",stu[i].num);
  printf("name: ");
  scanf("%s",stu[i].name);
   for(j=0;j<3;j++)
   { printf("score %d.",j+1);
    scanf("%d",&stu[i].score[j]);
   }
  printf("\n");
 }
}
print(stu)
struct student stu[];
{ int i,j;
printf("\nNo. Name Sco1 Sco2 Sco3\n");
for(i=0;i{ printf("%-6s%-10s",stu[i].num,stu[i].name);
 for(j=0;j<3;j++)
  printf("%-8d",stu[i].score[j]);
 printf("\n");
}
}
main()
{
 input();
 print();
}
==============================================================
【程序72】
题目:创建一个链表。
1.程序分析:           
2.程序源代码:
/*creat a list*/
#include "stdlib.h"
#include "stdio.h"
struct list
{ int data;
struct list *next;
};
typedef struct list node;
typedef node *link;
void main()
{ link ptr,head;
int num,i;
ptr=(link)malloc(sizeof(node));
ptr=head;
printf("please input 5 numbers==>\n");
for(i=0;i<=4;i++)
{
 scanf("%d",&num);
 ptr->data=num;
 ptr->next=(link)malloc(sizeof(node));
 if(i==4) ptr->next=NULL;
 else ptr=ptr->next;
}
ptr=head;
while(ptr!=NULL)
{ printf("The value is ==>%d\n",ptr->data);
 ptr=ptr->next;
}
}
==============================================================
【程序73】
题目:反向输出一个链表。   
1.程序分析:
2.程序源代码:
/*reverse output a list*/
#include "stdlib.h"
#include "stdio.h"
struct list
{ int data;
 struct list *next;
};
typedef struct list node;
typedef node *link;
void main()
{ link ptr,head,tail; 
 int num,i;
 tail=(link)malloc(sizeof(node));
 tail->next=NULL;
 ptr=tail;
 printf("\nplease input 5 data==>\n");
 for(i=0;i<=4;i++)
 {
  scanf("%d",&num);
  ptr->data=num;
  head=(link)malloc(sizeof(node));
  head->next=ptr;
  ptr=head;
 }
ptr=ptr->next;
while(ptr!=NULL)
{ printf("The value is ==>%d\n",ptr->data);
 ptr=ptr->next;
}}
==============================================================
【程序74】
题目:连接两个链表。
1.程序分析:
2.程序源代码:
#include "stdlib.h"
#include "stdio.h"
struct list
{ int data;
struct list *next;
};
typedef struct list node;
typedef node *link;
link delete_node(link pointer,link tmp)
{if (tmp==NULL) /*delete first node*/
 return pointer->next;
else
{ if(tmp->next->next==NULL)/*delete last node*/
  tmp->next=NULL;
 else /*delete the other node*/
  tmp->next=tmp->next->next;
 return pointer;
}
}
void selection_sort(link pointer,int num)
{ link tmp,btmp;
 int i,min;
 for(i=0;i {
 tmp=pointer;
 min=tmp->data;
 btmp=NULL;
 while(tmp->next)
 { if(min>tmp->next->data)
 {min=tmp->next->data;
  btmp=tmp;
 }
 tmp=tmp->next;
 }
printf("\40: %d\n",min);
pointer=delete_node(pointer,btmp);
}
}
link create_list(int array[],int num)
{ link tmp1,tmp2,pointer;
int i;
pointer=(link)malloc(sizeof(node));
pointer->data=array[0];
tmp1=pointer;
for(i=1;i{ tmp2=(link)malloc(sizeof(node));
 tmp2->next=NULL;
 tmp2->data=array[i];
 tmp1->next=tmp2;
 tmp1=tmp1->next;
}
return pointer;
}
link concatenate(link pointer1,link pointer2)
{ link tmp;
tmp=pointer1;
while(tmp->next)
 tmp=tmp->next;
tmp->next=pointer2;
return pointer1;
}
void main(void)
{ int arr1[]={3,12,8,9,11};
 link ptr;
 ptr=create_list(arr1,5);
 selection_sort(ptr,5);
}
==============================================================
【程序75】
题目:放松一下,算一道简单的题目。
1.程序分析:
2.程序源代码:
main()
{
int i,n;
for(i=1;i<5;i++)
{ n=0;
 if(i!=1)
 n=n+1;
 if(i==3)
 n=n+1;
 if(i==4)
 n=n+1;
 if(i!=4)
 n=n+1;
 if(n==3)
  printf("zhu hao shi de shi:%c",64+i);
 }
}
==============================================================
【程序76】
题目:编写一个函数,输入n为偶数时,调用函数求1/2+1/4+...+1/n,当输入n为奇数时,调用函数
   1/1+1/3+...+1/n(利用指针函数)
1.程序分析:
2.程序源代码:
main()
#include "stdio.h"
main()
{
float peven(),podd(),dcall();
float sum;
int n;
while (1)
{
 scanf("%d",&n);
 if(n>1)
  break;
}
if(n%2==0)
{
 printf("Even=");
 sum=dcall(peven,n);
}
else
{
 printf("Odd=");
 sum=dcall(podd,n);
}
printf("%f",sum);
}
float peven(int n)
{
float s;
int i;
s=1;
for(i=2;i<=n;i+=2)
 s+=1/(float)i;
return(s);
}
float podd(n)
int n;
{
float s;
int i;
s=0;
for(i=1;i<=n;i+=2)
 s+=1/(float)i;
return(s);
}
float dcall(fp,n)
float (*fp)();
int n;
{
float s;
s=(*fp)(n);
return(s);
}
==============================================================
【程序77】
题目:填空练习(指向指针的指针)
1.程序分析:     
2.程序源代码:
main()
{ char *s[]={"man","woman","girl","boy","sister"};
char **q;
int k;
for(k=0;k<5;k++)
{       ;/*这里填写什么语句*/
 printf("%s\n",*q);
}
}
==============================================================
【程序78】
题目:找到年龄最大的人,并输出。请找出程序中有什么问题。
1.程序分析:
2.程序源代码:
#define N 4
#include "stdio.h"
static struct man
{ char name[20];
int age;
} person[N]={"li",18,"wang",19,"zhang",20,"sun",22};
main()
{struct man *q,*p;
int i,m=0;
p=person;
for (i=0;i{if(mage)
 q=p++;
 m=q->age;}
printf("%s,%d",(*q).name,(*q).age);
}
==============================================================
【程序79】
题目:字符串排序。
1.程序分析:
2.程序源代码:
main()
{
char *str1[20],*str2[20],*str3[20];
char swap();
printf("please input three strings\n");
scanf("%s",str1);
scanf("%s",str2);
scanf("%s",str3);
if(strcmp(str1,str2)>0) swap(str1,str2);
if(strcmp(str1,str3)>0) swap(str1,str3);
if(strcmp(str2,str3)>0) swap(str2,str3);
printf("after being sorted\n");
printf("%s\n%s\n%s\n",str1,str2,str3);
}
char swap(p1,p2)
char *p1,*p2;
{
char *p[20];
strcpy(p,p1);strcpy(p1,p2);strcpy(p2,p);
}
==============================================================
【程序80】
题目:海滩上有一堆桃子,五只猴子来分。第一只猴子把这堆桃子凭据分为五份,多了一个,这只
   猴子把多的一个扔入海中,拿走了一份。第二只猴子把剩下的桃子又平均分成五份,又多了
   一个,它同样把多的一个扔入海中,拿走了一份,第三、第四、第五只猴子都是这样做的,
   问海滩上原来最少有多少个桃子?
1.程序分析:
2.程序源代码:
main()
{int i,m,j,k,count;
for(i=4;i<10000;i+=4)
{ count=0;
m=i;
for(k=0;k<5;k++)
{
 j=i/4*5+1;
 i=j;
 if(j%4==0)
  count++;
 else
  break;
}
 i=m;
 if(count==4)
 {printf("%d\n",count);
  break;}
}
}

【文章正文】
 【程序81】
题目:809*??=800*??+9*??+1 其中??代表的两位数,8*??的结果为两位数,9*??的结果为3位数。求??代表的两位数,及809*??后的结果。
1.程序分析:
2.程序源代码:
output(long b,long i)
{ printf("\n%ld/%ld=809*%ld+%ld",b,i,i,b%i);
}
main()
{long int a,b,i;
a=809;
for(i=10;i<100;i++)
{b=i*a+1;
if(b>=1000&&b<=10000&&8*i<100&&9*i>=100)
output(b,i); }
}
==============================================================
【程序82】
题目:八进制转换为十进制
1.程序分析:           
2.程序源代码:
main()
{ char *p,s[6];int n;
p=s;
gets(p);
n=0;
while(*(p)!='\0')
{n=n*8+*p-'0';
p++;}
printf("%d",n);
}
==============================================================
【程序83】
题目:求0—7所能组成的奇数个数。
1.程序分析:
2.程序源代码:
main()
{
long sum=4,s=4;
int j;
for(j=2;j<=8;j++)/*j is place of number*/
{ printf("\n%ld",sum);
if(j<=2)
s*=7;
else
s*=8;
sum+=s;}
printf("\nsum=%ld",sum);
}
==============================================================
【程序84】
题目:一个偶数总能表示为两个素数之和。
1.程序分析:
2.程序源代码:
#include "stdio.h"
#include "math.h"
main()
{ int a,b,c,d;
scanf("%d",&a);
for(b=3;b<=a/2;b+=2)
{ for(c=2;c<=sqrt(b);c++)
if(b%c==0) break;
if(c>sqrt(b))
d=a-b;
else
break;
for(c=2;c<=sqrt(d);c++)
if(d%c==0) break;
if(c>sqrt(d))
printf("%d=%d+%d\n",a,b,d);
}
}
==============================================================
【程序85】
题目:判断一个素数能被几个9整除
1.程序分析:
2.程序源代码:
main()
{ long int m9=9,sum=9;
int zi,n1=1,c9=1;
scanf("%d",&zi);
while(n1!=0)
{ if(!(sum%zi))
n1=0;
else
{m9=m9*10;
sum=sum+m9;
c9++;
}
}
printf("%ld,can be divided by %d \"9\"",sum,c9);
}
==============================================================
【程序86】
题目:两个字符串连接程序
1.程序分析:
2.程序源代码:
#include "stdio.h"
main()
{char a[]="acegikm";
char b[]="bdfhjlnpq";
char c[80],*p;
int i=0,j=0,k=0;
while(a[i]!='\0'&&b[j]!='\0')
{if (a[i] { c[k]=a[i];i++;}
else
c[k]=b[j++];
k++;
}
c[k]='\0';
if(a[i]=='\0')
p=b+j;
else
p=a+i;
strcat(c,p);
puts(c);
}
==============================================================
【程序87】
题目:回答结果(结构体变量传递)
1.程序分析:     
2.程序源代码:
#include "stdio.h"
struct student
{ int x;
char c;
} a;
main()
{a.x=3;
a.c='a';
f(a);
printf("%d,%c",a.x,a.c);
}
f(struct student b)
{
b.x=20;
b.c='y';
}
==============================================================
【程序88】
题目:读取7个数(1—50)的整数值,每读取一个值,程序打印出该值个数的*。
1.程序分析:
2.程序源代码:
main()
{int i,a,n=1;
while(n<=7)
{ do {
   scanf("%d",&a);
   }while(a<1||a>50);
for(i=1;i<=a;i++)
 printf("*");
printf("\n");
n++;}
getch();
}
==============================================================
【程序89】
题目:某个公司采用公用电话传递数据,数据是四位的整数,在传递过程中是加密的,加密规则如下:
   每位数字都加上5,然后用和除以10的余数代替该数字,再将第一位和第四位交换,第二位和第三位交换。
1.程序分析:
2.程序源代码:
main()
{int a,i,aa[4],t;
scanf("%d",&a);
aa[0]=a%10;
aa[1]=a%100/10;
aa[2]=a%1000/100;
aa[3]=a/1000;
for(i=0;i<=3;i++)
 {aa[i]+=5;
 aa[i]%=10;
 }
for(i=0;i<=3/2;i++)
 {t=aa[i];
 aa[i]=aa[3-i];
 aa[3-i]=t;
 }
for(i=3;i>=0;i--)
printf("%d",aa[i]);
}
==============================================================
【程序90】
题目:专升本一题,读结果。
1.程序分析:
2.程序源代码:
#include "stdio.h"
#define M 5
main()
{int a[M]={1,2,3,4,5};
int i,j,t;
i=0;j=M-1;
while(i {t=*(a+i);
*(a+i)=*(a+j);
*(a+j)=t;
i++;j--;
}
for(i=0;i printf("%d",*(a+i));
}

【程序91】
题目:时间函数举例1
1.程序分析:
2.程序源代码:
#include "stdio.h"
#include "time.h"
void main()
{ time_t lt; /*define a longint time varible*/
lt=time(NULL);/*system time and date*/
printf(ctime(<)); /*english format output*/
printf(asctime(localtime(<)));/*tranfer to tm*/
printf(asctime(gmtime(<))); /*tranfer to Greenwich time*/
}
==============================================================
【程序92】
题目:时间函数举例2
1.程序分析:           
2.程序源代码:
/*calculate time*/
#include "time.h"
#include "stdio.h"
main()
{ time_t start,end;
int i;
start=time(NULL);
for(i=0;i<3000;i++)
{ printf("\1\1\1\1\1\1\1\1\1\1\n");}
end=time(NULL);
printf("\1: The different is %6.3f\n",difftime(end,start));
}
==============================================================
【程序93】
题目:时间函数举例3
1.程序分析:
2.程序源代码:
/*calculate time*/
#include "time.h"
#include "stdio.h"
main()
{ clock_t start,end;
int i;
double var;
start=clock();
for(i=0;i<10000;i++)
{ printf("\1\1\1\1\1\1\1\1\1\1\n");}
end=clock();
printf("\1: The different is %6.3f\n",(double)(end-start));
}
==============================================================
【程序94】
题目:时间函数举例4,一个猜数游戏,判断一个人反应快慢。(版主初学时编的)
1.程序分析:
2.程序源代码:
#include "time.h"
#include "stdlib.h"
#include "stdio.h"
main()
{char c;
clock_t start,end;
time_t a,b;
double var;
int i,guess;
srand(time(NULL));
printf("do you want to play it.('y' or 'n') \n");
loop:
while((c=getchar())=='y')
{
i=rand()%100;
printf("\nplease input number you guess:\n");
start=clock();
a=time(NULL);
scanf("%d",&guess);
while(guess!=i)
{if(guess>i)
{printf("please input a little smaller.\n");
scanf("%d",&guess);}
else
{printf("please input a little bigger.\n");
scanf("%d",&guess);}
}
end=clock();
b=time(NULL);
printf("\1: It took you %6.3f seconds\n",var=(double)(end-start)/18.2);
printf("\1: it took you %6.3f seconds\n\n",difftime(b,a));
if(var<15)
printf("\1\1 You are very clever! \1\1\n\n");
else if(var<25)
printf("\1\1 you are normal! \1\1\n\n");
else
printf("\1\1 you are stupid! \1\1\n\n");
printf("\1\1 Congradulations \1\1\n\n");
printf("The number you guess is %d",i);
}
printf("\ndo you want to try it again?(\"yy\".or.\"n\")\n");
if((c=getch())=='y')
goto loop;
}
==============================================================
【程序95】
题目:家庭财务管理小程序
1.程序分析:
2.程序源代码:
/*money management system*/
#include "stdio.h"
#include "dos.h"
main()
{
FILE *fp;
struct date d;
float sum,chm=0.0;
int len,i,j=0;
int c;
char ch[4]="",ch1[16]="",chtime[12]="",chshop[16],chmoney[8];
pp: clrscr();
sum=0.0;
gotoxy(1,1);printf("|---------------------------------------------------------------------------|");
gotoxy(1,2);printf("| money management system(C1.0) 2000.03 |");
gotoxy(1,3);printf("|---------------------------------------------------------------------------|");
gotoxy(1,4);printf("| -- money records -- | -- today cost list -- |");
gotoxy(1,5);printf("| ------------------------ |-------------------------------------|");
gotoxy(1,6);printf("| date: -------------- | |");
gotoxy(1,7);printf("| | | | |");
gotoxy(1,8);printf("| -------------- | |");
gotoxy(1,9);printf("| thgs: ------------------ | |");
gotoxy(1,10);printf("| | | | |");
gotoxy(1,11);printf("| ------------------ | |");
gotoxy(1,12);printf("| cost: ---------- | |");
gotoxy(1,13);printf("| | | | |");
gotoxy(1,14);printf("| ---------- | |");
gotoxy(1,15);printf("| | |");
gotoxy(1,16);printf("| | |");
gotoxy(1,17);printf("| | |");
gotoxy(1,18);printf("| | |");
gotoxy(1,19);printf("| | |");
gotoxy(1,20);printf("| | |");
gotoxy(1,21);printf("| | |");
gotoxy(1,22);printf("| | |");
gotoxy(1,23);printf("|---------------------------------------------------------------------------|");
i=0;
getdate(&d);
sprintf(chtime,"%4d.%02d.%02d",d.da_year,d.da_mon,d.da_day);
for(;;)
{
gotoxy(3,24);printf(" Tab __browse cost list Esc __quit");
gotoxy(13,10);printf(" ");
gotoxy(13,13);printf(" ");
gotoxy(13,7);printf("%s",chtime);
j=18;
ch[0]=getch();
if(ch[0]==27)
break;
strcpy(chshop,"");
strcpy(chmoney,"");
if(ch[0]==9)
{
mm:i=0;
fp=fopen("home.dat","r+");
gotoxy(3,24);printf(" ");
gotoxy(6,4);printf(" list records ");
gotoxy(1,5);printf("|-------------------------------------|");
gotoxy(41,4);printf(" ");
gotoxy(41,5);printf(" |");
while(fscanf(fp,"%10s%14s%f\n",chtime,chshop,&chm)!=EOF)
{ if(i==36)
{ getch();
i=0;}
if ((i%36)<17)
{ gotoxy(4,6+i);
printf(" ");
gotoxy(4,6+i);}
else
if((i%36)>16)
{ gotoxy(41,4+i-17);
printf(" ");
gotoxy(42,4+i-17);}
i++;
sum=sum+chm;
printf("%10s %-14s %6.1f\n",chtime,chshop,chm);}
gotoxy(1,23);printf("|---------------------------------------------------------------------------|");
gotoxy(1,24);printf("| |");
gotoxy(1,25);printf("|---------------------------------------------------------------------------|");
gotoxy(10,24);printf("total is %8.1f$",sum);
fclose(fp);
gotoxy(49,24);printf("press any key to.....");getch();goto pp;
}
else
{
while(ch[0]!='\r')
{ if(j<10)
{ strncat(chtime,ch,1);
j++;}
if(ch[0]==8)
{
len=strlen(chtime)-1;
if(j>15)
{ len=len+1; j=11;}
strcpy(ch1,"");
j=j-2;
strncat(ch1,chtime,len);
strcpy(chtime,"");
strncat(chtime,ch1,len-1);
gotoxy(13,7);printf(" ");}
gotoxy(13,7);printf("%s",chtime);ch[0]=getch();
if(ch[0]==9)
goto mm;
if(ch[0]==27)
exit(1);
}
gotoxy(3,24);printf(" ");
gotoxy(13,10);
j=0;
ch[0]=getch();
while(ch[0]!='\r')
{ if (j<14)
{ strncat(chshop,ch,1);
j++;}
if(ch[0]==8)
{ len=strlen(chshop)-1;
strcpy(ch1,"");
j=j-2;
strncat(ch1,chshop,len);
strcpy(chshop,"");
strncat(chshop,ch1,len-1);
gotoxy(13,10);printf(" ");}
gotoxy(13,10);printf("%s",chshop);ch[0]=getch();}
gotoxy(13,13);
j=0;
ch[0]=getch();
while(ch[0]!='\r')
{ if (j<6)
{ strncat(chmoney,ch,1);
j++;}
if(ch[0]==8)
{ len=strlen(chmoney)-1;
strcpy(ch1,"");
j=j-2;
strncat(ch1,chmoney,len);
strcpy(chmoney,"");
strncat(chmoney,ch1,len-1);
gotoxy(13,13);printf(" ");}
gotoxy(13,13);printf("%s",chmoney);ch[0]=getch();}
if((strlen(chshop)==0)||(strlen(chmoney)==0))
continue;
if((fp=fopen("home.dat","a+"))!=NULL);
fprintf(fp,"%10s%14s%6s",chtime,chshop,chmoney);
fputc('\n',fp);
fclose(fp);
i++;
gotoxy(41,5+i);
printf("%10s %-14s %-6s",chtime,chshop,chmoney);
}}}
==============================================================
【程序96】
题目:计算字符串中子串出现的次数
1.程序分析:
2.程序源代码:
#include "string.h"
#include "stdio.h"
main()
{ char str1[20],str2[20],*p1,*p2;
int sum=0;
printf("please input two strings\n");
scanf("%s%s",str1,str2);
p1=str1;p2=str2;
while(*p1!='\0')
{
if(*p1==*p2)
{while(*p1==*p2&&*p2!='\0')
{p1++;
p2++;}
}
else
p1++;
if(*p2=='\0')
sum++;
p2=str2;
}
printf("%d",sum);
getch();}
==============================================================
【程序97】
题目:从键盘输入一些字符,逐个把它们送到磁盘上去,直到输入一个#为止。
1.程序分析:     
2.程序源代码:
#include "stdio.h"
main()
{ FILE *fp;
char ch,filename[10];
scanf("%s",filename);
if((fp=fopen(filename,"w"))==NULL)
{printf("cannot open file\n");
exit(0);}
ch=getchar();
ch=getchar();
while(ch!='#')
{fputc(ch,fp);putchar(ch);
ch=getchar();
}
fclose(fp);
}
==============================================================
【程序98】
题目:从键盘输入一个字符串,将小写字母全部转换成大写字母,然后输出到一个磁盘文件“test”中保存。
   输入的字符串以!结束。
1.程序分析:
2.程序源代码:
#include "stdio.h"
main()
{FILE *fp;
char str[100],filename[10];
int i=0;
if((fp=fopen("test","w"))==NULL)
{ printf("cannot open the file\n");
exit(0);}
printf("please input a string:\n");
gets(str);
while(str[i]!='!')
{ if(str[i]>='a'&&str[i]<='z')
str[i]=str[i]-32;
fputc(str[i],fp);
i++;}
fclose(fp);
fp=fopen("test","r");
fgets(str,strlen(str)+1,fp);
printf("%s\n",str);
fclose(fp);
}
==============================================================
【程序99】
题目:有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列),
   输出到一个新文件C中。
1.程序分析:
2.程序源代码:
#include "stdio.h"
main()
{ FILE *fp;
int i,j,n,ni;
char c[160],t,ch;
if((fp=fopen("A","r"))==NULL)
{printf("file A cannot be opened\n");
exit(0);}
printf("\n A contents are :\n");
for(i=0;(ch=fgetc(fp))!=EOF;i++)
{c[i]=ch;
putchar(c[i]);
}
fclose(fp);
ni=i;
if((fp=fopen("B","r"))==NULL)
{printf("file B cannot be opened\n");
exit(0);}
printf("\n B contents are :\n");
for(i=0;(ch=fgetc(fp))!=EOF;i++)
{c[i]=ch;
putchar(c[i]);
}
fclose(fp);
n=i;
for(i=0;ifor(j=i+1;jif(c[i]>c[j])
{t=c[i];c[i]=c[j];c[j]=t;}
printf("\n C file is:\n");
fp=fopen("C","w");
for(i=0;i{ putc(c[i],fp);
putchar(c[i]);
}
fclose(fp);
}
==============================================================
【程序100】
题目:有五个学生,每个学生有3门课的成绩,从键盘输入以上数据(包括学生号,姓名,三门课成绩),计算出
   平均成绩,况原有的数据和计算出的平均分数存放在磁盘文件"stud"中。
1.程序分析:
2.程序源代码:
#include "stdio.h"
struct student
{ char num[6];
char name[8];
int score[3];
float avr;
} stu[5];
main()
{int i,j,sum;
FILE *fp;
/*input*/
for(i=0;i<5;i++)
{ printf("\n please input No. %d score:\n",i);
printf("stuNo:");
scanf("%s",stu[i].num);
printf("name:");
scanf("%s",stu[i].name);
sum=0;
for(j=0;j<3;j++)
{ printf("score %d.",j+1);
scanf("%d",&stu[i].score[j]);
sum+=stu[i].score[j];
}
stu[i].avr=sum/3.0;
}
fp=fopen("stud","w");
for(i=0;i<5;i++)
if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)
printf("file write error\n");
fclose(fp);
}

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