Bit Operations using Macros

Code

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

#define g 0b10000100
#define g1 0b11110111
#define g2 0b00100000 
uint8_t modify_register(uint8_t reg) 
{   
    reg=reg|g;
    reg=reg&g1;
    reg=reg^g2; 
    return reg;
}

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

Solving Approach