How can I print ■ in visual studio c?

I want to print ■(in ascii code 254) in c visual studio project with function printf, but my program can't print. Just like(? instead of ■)

My program can print ascii character 32 ~ 128.

I think since 129~254 is extended ascii, it requires more code(header?other function?).

How can i print ■? help me please.

here is my code.

#include<stdio.h>
int main() {
    unsigned char count;
    for (count = 32; count < 255; count++) {
        printf("  %3d - %c", count, count);
        if (count % 6 == 0) {
            printf("\n");
        }
    }
    return 0;
}

I just have solved by adding system("chcp 437"), which changes language Korean to English in cmd(dos window).

here is my code

#include<stdio.h>
#include<Windows.h>
int main() {
    unsigned char count;
    system("chcp 437");
    for (count = 32; count < 255; count++) {
        printf("  %3d - %c", count, count);
        if (count % 6 == 0) {
            printf("\n");
        }
    }
    return 0;
}