Bit Shifting and Byte Display

bit_shifting.c

// C program to demonstrate the
// showbits() function
#include <stdio.h>

#define BV(bit)               (1 << bit)
#define setBit(byte, bit)     (byte |= BV(bit))
#define clearBit(byte, bit)   (byte &= ~BV(bit))
#define toggleBit(byte, bit)  (byte ^= BV(bit))
#define getBit(byte, bit)     (byte >> bit) & BV(0)

void showByte (int value) {
    int n;
    for (n=8-1;n>=0;n--) {
        printf("%d",(value >>n)&1);
    }
}

// demonstrate displaying of byte and retrieving of value
int main()
{
    int value = 0b0100100;
    int n;
    showByte(value);
    printf("\n");
    printf("%d", getBit(value,2));
    return 0;
}