#include <stdio.h>

int main() {

    int *p;

    p = NULL;
    printf ("The value of the pointer is %p\n", p);
    printf ("The value of the pointer is %d\n", p);

    p = 0;
    printf ("The value of the pointer is %p\n", p);
    printf ("The value of the pointer is %d\n", p);

    if ( p ) {
        printf("p is now true\n");
    }
    else {
        printf("p is now false\n");
    }

    int i = 3;
    
    p = &i;

    if ( p ) {
        printf("p is now true\n");
    }
    else {
        printf("p is now false\n");
    }


    // Any integer other than 0 is true
    if ( 1 ) {
      printf("1 is true\n");
    } else {
      printf("1 is false\n");
    }

    if ( 0 ) {
      printf("0 is true\n");
    } else {
      printf("0 is false\n");
    }

    return 0;

}