Bit Operations using Macros

Code

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

// Define bitwise macros here
#define bit(n) (1U << (n)) // Bit mask
#define set(reg, n) (reg |= bit(n)) // Set bit n
#define clear(reg, n) (reg &= ~(bit(n))) // Clear bit n
#define toggle(reg, n) (reg ^= bit(n)) // Toggle bit n

uint8_t modify_register(uint8_t reg) {
    set(reg, 2);
    set(reg, 7);
    clear(reg, 3);
    toggle(reg, 5);
    return reg;
}

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

Solving Approach