题解 | while

#include <stdio.h>

int main() {
	char form[5] = { 'w','h','i','l','e' };
	int times = 0;
	for (int i = 0; i < 5; i++) {
		char revise = ' ';
		scanf("%c", &revise);
		if (revise != form[i]) {
			times++;
		}
	}
    printf("%d", times);
	return 0;
}