Bit Operations using Macros

Code

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

#define ONE ((1<<2) | (1<<7))
#define TWO (~(1<<3))
#define THREE (1<<5)

uint8_t modify_register(uint8_t reg) {
    reg = reg | ONE;
    reg = reg & TWO;
    reg = reg ^ THREE;
    return reg;
}

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

Solving Approach