linux运行c出现乱码

export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8

#include <stdio.h>
#include <locale.h>

int main() {
    setlocale(LC_ALL, "en_US.UTF-8");
    printf("Hello, 世界!\n");
    return 0;
}

#include <stdio.h>
#include <locale.h>

int main() {
    FILE *file = fopen("test.txt", "r");
    if (file == NULL) {
        perror("Failed to open file");
        return 1;
    }
    setlocale(LC_ALL, "en_US.UTF-8");
    char buffer[1024];
    while (fgets(buffer, sizeof(buffer), file) != NULL) {
        printf("%s", buffer);
    }
    fclose(file);
    return 0;
}