Control Instructions - General Questions

What will be the output of the program?

#include <stdio.h>

int main(void) {
    int n = 1234, r = 0;
    while (n) { r = r * 10 + n % 10; n /= 10; }
    printf("%d\n", r);
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    int i;
    for (i = 0; i < 5; i++);
    printf("%d\n", i);
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    int i = 5;
    if (i > 3)
        if (i > 10)
            printf("big\n");
        else
            printf("medium\n");
    return 0;
}

What will be the output of the program?

#include <stdio.h>

int main(void) {
    int i = 0;
    while (i++ < 3)
        printf("%d ", i);
    printf("\n");
    return 0;
}

What does for (;;) create?