Bit Operations using Macros

Code

#include <stdio.h>
#include <stdint.h>

#define SET_BITS_2_7 ((0xFF & (1<<2)) |(0xFF &(1<<7)))
#define CLEAR_BIT_3  ((0xFF & ~(1<<3)))
#define TOGGLE_BIT_5 ((0xFF & (1<<5)))

uint8_t modify_register(uint8_t reg) 
{
    reg = reg | SET_BITS_2_7;
    reg = reg & CLEAR_BIT_3;
    reg = reg ^ TOGGLE_BIT_5;
    return reg;
}

int main() {
    uint8_t reg;
    scanf("%hhu", &reg);
    printf("%u", modify_register(reg));
    return 0;
}

Solving Approach