Bit Operations using Macros

Code

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

#define BIT_TOGGLE(reg, b) (*reg ^= (1 << (b)))
#define SET_BIT(reg, b) (*reg |= (1 << (b)))
#define CLEAR_BIT(reg, b) (*reg &= ~(1 << (b)))

uint8_t modify_register(uint8_t reg) {
    SET_BIT(&reg, 2);    // Set bit 2
    SET_BIT(&reg, 7);    // Set bit 7
    CLEAR_BIT(&reg, 3);  // Clear bit 3
    BIT_TOGGLE(&reg, 5); // Toggle bit 5

    return reg;
}

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

Solving Approach