题解 | #计算某字母出现次数#

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

int main()
{
    char in_str[512] = {0};
    int counter = 0;
    char c;
    int i, len;


    scanf("%[^\n]\n", in_str);
    //scanf("%c", &c);
    c = getchar();
    len = strlen(in_str);

    //printf("%s, c=%c", in_str, c);
    for (i = 0; i < len; i++){
        if ( in_str[i] == c || in_str[i] == (c -32) || in_str[i] == (c + 32)){
            counter++;
        }

    }
    printf("%d", counter);
    return 0;

}