How to redirect the output back to the screen after freopen("out.txt", "a", stdout)

#include <stdio.h>



int main() {

    printf("This goes to screen\n");

    freopen("out.txt", "a", stdout);

    printf("This goes to out.txt");

    freopen("/dev/stdout", "a", stdout);

    printf("This should go to screen too, but doesn't\n");



    return 0;

}

I call freopen to redirect the stdout to out.txt then I print something on the file, now I want to redirect it back to the screen, but freopen("/dev/stdout", "a", stdout); doesn't work. Is there any way to do that using ANSI C or POSIX system calls?