#include <stdint.h>
#include <stdio.h>

void* align(void *ptr, unsigned int n) {
    uintptr_t address = (uintptr_t)ptr;
    uintptr_t mask = (1 << n) -1;
    if (address & mask) {
	address = address & ~mask; 
	address = address + (1<<n);
	return (void*)address;
    } else {
        return ptr;
    }
}



int main(void){
    int a;
    char* b = (char*)&a;
    for (int i = 0; i < 20; i++){
        printf("Aligned %p:  %p\n", b, align(b, 3));
        b++;
    }
    return 0;
}