Bit Operations using Macros

Code

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

// Define bitwise macros here

#define SET_BITS(r,b) (r |= (1U << b))
#define CLEAR_BITS(r,b) (r &= ~(1U << b))
#define TOGGLE_BITS(r,b) (r ^= (1U << b))

uint8_t modify_register(uint8_t reg) {
    // Apply operations in order

    SET_BITS(reg, 2);
    SET_BITS(reg, 7);
    CLEAR_BITS(reg, 3);
    TOGGLE_BITS(reg, 5);
    return reg;
}

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

Solving Approach