程序代码：

#include<stdio.h>
#include<string.h>

void count(char c,char *s);
int main()
{
  char c,s[30];
  scanf("%c%s",&c,s);
  count(c,s);
   return 0;
}
void count(char c,char *s)
{
  int len=strlen(s);
  int i,n=0;
  for(i=0;i<len;i++)
   if(c==s[i])
    n++;
  printf("%c in %s has appear %d times.",c,s,n);
} 

程序代码：

#include <stdio.h>
int main(int argc, char *argv[])
{
    int str[128] = {0};
    int chDest = getchar();
    getchar();
    int chSrc;
    while((chSrc = getchar()) != '\n')
    {
        ++str[chSrc];
    }
    printf("%d\n", str[chDest]);
    return 0;
}