#include<math.h>#include<stdio.h>main(){ int k=-1,i,flag=1, ch; float x; double t,sum,biaozhun; while(flag==1) {  printf("Input the jiao's data:\n");     scanf("%f",&x);     t=x;     sum=x;     biaozhun=sin(x);     printf("biaozhun:sin(%f)=%f\n",x,biaozhun);     for(i=2;(fabs(t))>1e-5;i+=2)  {    t=k*t*x*x/(i*(i+1));    sum+=t;  }     printf("sin(%f)=%f\n",x,sum);  printf("continue or not?(1---Yes;0---No.)\n");  scanf("%d",&ch);  if(ch==1)     {    flag=1;    ch=0;//注意：此处的ch=0不能省略，每次到此都要把ch重新赋为零值，  }                   // 以便下次重新给ch赋值；否则会出现死循环现象。  else         flag=0;   }}

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