#include <stdio.h>
void squareme(int *const a){
    printf("a %d  *a %d\n",a,*a);
    *a = *a * *a;
    return;
}
int main(void){
	int a=2;
	const int n=4;
	int i;
	for (i=0;i<n;++i){	
		squareme(&a);
		printf("%d\n",a);	
	}
	return;
}