#include <stdio.h>
#include <unistd.h>

int main() {
    const char *msg = "Hello, world!\n";
    
    // 使用 write 系统调用向标准输出（文件描述符 1）写入数据
    ssize_t result = write(1, msg, 14);

    if (result == -1) {
        perror("write failed");
        return 1;
    }

    printf("Successfully wrote %zd bytes.\n", result);

    return 0;
}