Bit Operations using Macros

Code

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

#define SETBIT reg |= 0X84
#define CLEARBIT reg &= ~0X08
#define toggle reg ^= (1u<<5)


uint8_t modify_register(uint8_t reg) {
   SETBIT;
   CLEARBIT;
   toggle;
    return reg;
}

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

Solving Approach