A small test for understanding bytes shifting and when you get an overflow.

shift_overflow.c

#include<stdio.h>
#include<limits.h>

int main(void) {

	unsigned int x = 1;
	int x2 = 1;
	printf("unsigned: %u\n", x << 31);
	printf("signed:(-1) %d\n", (x2 << 31) - 1);
	printf("signed: %d\n", x2 << 31);
	printf("MAX_INT: %d\n", INT_MAX);
	return 0;
}