Bit Operations using Macros

Code

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

#define set_bit(reg, bit) ((reg) |= (1U<<(bit)))
#define clear_bit(reg, bit) ((reg) &= ~(1U<<(bit)))
#define toggle_bit(reg, bit) ((reg) ^= (1U<<(bit)))

uint8_t modify_register(uint8_t reg) {
    set_bit(reg, 2);
    set_bit(reg, 7);
    clear_bit(reg, 3);
    toggle_bit(reg, 5);
    return reg;
}

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

Solving Approach