#include<stdio.h>#include<ctype.h>void main(void){ char c,c1,c2,top; printf("Input a character:\n"); top=isupper(c=getchar())?'A':(islower(c)?'a':'\0'); if(top) {  for(c1=top;c1<=c;++c1)  {   printf("%*c",40-(c1-top<<1));    for(c2=top;c2<=c1;++c2)     printf("%2c",c2);    for(c2=c1-1;c2>=top;--c2)     printf("%2c",c2);    printf("\n");  } }}

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