#include <stdio.h>

void change( int * );

main(){

 int var = 3;

 printf("The value of a variable:\n");
 printf("\tBefore a function call: %d\n",var);

 change( &var );

 printf("\tAfter a function call: %d\n",var);

}

void change(int * var) {

	(*var)++;

	printf("\tInside a function call: %d\n",*var);
}