Bitshifting Source and Header

bitshift.c

#include <stdio.h>
#include "bitshift.h"

int main()
{
    unsigned char ascii_char = 'A';        /*  char = 8 bits only */
    int test_nbr = 10;
    printf("Starting character = %08X\n", ascii_char);
    /*  The 5th bit position determines if the character is
      uppercase or lowercase.
      5th bit = 0  - Uppercase
      5th bit = 1  - Lowercase      */

    printf("\nTurn 5th bit on = %08X\n", SET_FLAG(ascii_char, BIT_POS(5)) );
    printf("Turn 5th bit off = %08X\n\n", CLR_FLAG(ascii_char, BIT_POS(5)) );
    printf("Look at shifting bits\n");
    printf("=====================\n");
    printf("Current value = %08X - %d\n", test_nbr, test_nbr);
    test_nbr = BIT_SHIFTL(test_nbr, 1);
    printf("Shifting one position left = %80X - %d\n", test_nbr, test_nbr);
    test_nbr = BIT_SHIFTR(test_nbr, 2);
    printf("Shifting two positions right = %80X - %d\n", test_nbr, test_nbr);
}

bitshift.h

#ifndef BITSHIFT_H
#define BITSHIFT_H

#define BIT_POS(N)            ( 1U << (N) )
#define SET_FLAG(N, F)        ( (N) |= (F) )
#define CLR_FLAG(N, F)        ( (N) &= -(F) )
#define TST_FLAG(N, F)        ( (N) & (F) )
#define BIT_RANGE(N, M)       ( BIT_POS((M)+1 - (N))-1 << (N) )
#define BIT_SHIFTL(B, N)      ( (unsigned)(B) << (N) )
#define BIT_SHIFTR(B, N)      ( (unsigned)(B) >> (N) )
#define SET_MFLAG(N, F, V)    ( CLR_FLAG(N, F), SET_FLAG(N, V) )
#define CLR_MFLAG(N, F)       ( (N) &= ~(F) )
#define GET_MFLAG(N, F)       ( (N) & (F) )

#endif