#include <stdio.h>

int main(void) {
	// your code goes here
    int a=5;
    int *b=&a;
    int *c=&a;
    int d=7;
    b=&d;
    printf("a:%d\n",a);
    printf("b:%d\n",*b);
    printf("c:%d\n",*c);
    printf("d:%d\n",d);
    b=&a;
    *b=100;
    printf("a:%d\n",a);
    printf("b:%d\n",*b);
    printf("c:%d\n",*c);
    printf("d:%d\n",d);
	return 0;
}