#include<stdio.h>

int main(){
	char x = 0xf;
	printf("%x\n", x & 0xa);
	printf("%d\n", 3 << 2);

	int a = 0x3;
	int b = 0xD;
	if(a && b)
		printf ("a && b is true\n");
	if(a & b)
		printf("a & b is true\n");

	printf("~3 = %x\n", ~3);
	return 0;
}