题解 | #计算某字符出现次数#

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

void count_numbers_character( char* str,
                              char ch) { //字符串由字母、数字、空格组成
    char* curr = str;
    int count = 0; //count用于计算ch字符总数
    if (ch >= 'A' && ch <= 'Z') {
        ch = ch + 32;  //题目不区分大小写，大写字母转化为小写字母计数
    }
    while (*curr) {
        if (*curr >= 'A' && *curr <= 'Z') {
            *curr = (*curr) + 32;  //将字符串中大写字母转化为小写字母计数
        }
        if (ch == *curr) {
            count++;
        }
        curr++;
    }
    printf("%d\n", count);
}
int main() {
    char str[1001];
    gets(str);
    char ch = getchar();
    count_numbers_character( str, ch);
    return 0;
}