题解 | #计算某字符出现次数#

#include <stdio.h>

#include<ctype.h>

int main() {

int a = 0, b = 0,len=0;
char i, j, s[1000];
gets_s(s);
scanf("%c",&i);
char *p = s;
i = tolower(i);
while (*p != 0) {
    s[a] = tolower(s[a]);
    if (s[a] == i) {
        b++;
    }
    a++;
    p++;
    
}

printf("%d", b);
return 0;

}