#include <stdio.h>

void app_main() {

int x = 5;
int y = 8;
int *ptr;

ptr = &x;
printf("Value is: %d\n", *ptr);

ptr = &y;
printf("Value is: %d\n", *ptr);

*ptr = 7;
printf("Value is: %d\n", *ptr);
printf("Value is: %d\n", y);

y = 2;
printf("Value is: %d\n", *ptr);

}