Bit Operations using Macros

Code

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

#define set (0x84)
#define clear (0xf7)
#define toggle (0x20)

uint8_t modify_register(uint8_t reg) {
    reg|=set;
    reg&=clear;
    reg^=toggle;
    return reg;
}

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

Solving Approach