rotate_bits.c

//https://www.geeksforgeeks.org/rotate-bits-of-an-integer/

/*
 * rotate_bits.c
 *
 *  Created on: Aug 2, 2018
 *      Author: sikanrong
 */

#include <stdio.h>
#include <stdint.h>
int main(){
	//unsigned 8-bit integer, alias for char
	uint8_t n = 0;
	int r;
	char d;

	printf("Direction to rotate (l or r): ");
	scanf("%c", &d);

	printf("Integer upon which to perform rotation: ");
	scanf("%u", &n);

	printf("Positions to rotate (integer): ");
	scanf("%i", &r);

	while(r){
		if(d == 'r'){
			int mask = 1;
			int bit = (n & mask);
			n = n >> 1;
			n += (bit << 7);
		}else{
			int mask = 1 << 7;
			//is leftmost bit set?
			int bit = (n & mask);
			n = (n << 1);
			n += (bit >> 7);
		}
		r--; //one less rotation
	}

	printf("Rotated value: %u", n);
}