C题解 | 计算某字符出现次数

#include <stdio.h>
#include <stdlib.h>

int main() {
    char *s = NULL, c, p;
    int len = 0, buff = 0, count = 0; // p is pair to c
    len = getline(&s, &buff, stdin);
    if(scanf(" %c", &c) != 1) return 0;
    if(65 <= c && c <= 90) {
        p = c + 32;
    } else if (97 <= c && c <= 122) {
        p = c - 32;
    } else {
        p = c;
    }
    len--;
    for(int i = 0; i < len; i++) {
        if(s[i] == c || s[i] == p) count++;
    }
    printf("%d", count);
    return 0;
}

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