题解 | #计算某字符出现次数#

#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#define N 1002
int main() {
    char str[N], c;
    int num, i, a;
    char * p;
    fgets(str, sizeof(str), stdin);
    c = getchar();
    p = str;
    num = 0;
    if (isalpha(c)) {
    if( 'a' <= c && c <= 'z')
    {
        a = -32;
    }
    else {
        a = 32;
    }
    for(i =0; i < N;i++)
    {   
        if (* p == c || * p == c + a ) {
            num++;
        }
         if (* p == '\0') {
                break;
            }
            p++;
    }
    }
    else {
         for(i =0; i < N;i++)
    {   
        if (* p == c ) {
            num++;
        }
         if (* p == '\0') {
                break;
            }
            p++;
    }
    }
    printf("%d", num);

    return 0;
}