程式語言 - GNU - C/C++ - Get Environ

參考資訊：
https://stackoverflow.com/questions/2910377/get-home-directory-in-linux

main.c

#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char **argv)
{
    const char *homedir = getenv("HOME");

    printf("%s\n", homedir);
    return 0;
}