为什么直接输出没乱码，用%输出就出现了乱码

Question

把黑方框换成字母就正常了，但用黑方框就乱码

#include<stdio.h>
#pragma warning(disable:4996)
#include<time.h>
int main() {
    char samp[3] = { '■' ,'■', '■'  };
    int i = 0;
    printf("■\n");
    while (i < 3) {
        printf("%c", samp[i]);
        i++;
    }
    return 0;
}

Answer 1

改成字符串就可以了，供参考：

#include<stdio.h>
#pragma warning(disable:4996)
#include<time.h>
int main() {
    char samp[3][3] = { "■" ,"■", "■"};
    int i = 0;
    printf("■\n");
    while (i < 3) {
        printf("%s", samp[i]);
        i++;
    }
    return 0;
}