Bit Operations using Macros

Code

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

// Define bitwise macros here
#define setbit(r, b) ((r) |= (1 << (b)))
#define clearbit(r, b) ((r) &= ~(1 << (b)))
#define togglebit(r, b) ((r) ^= (1 << (b)))

uint8_t modify_register(uint8_t reg) {
    setbit(reg, 2);
    setbit(reg, 7);
    clearbit(reg, 3);
    togglebit(reg, 5);
    return reg;
}

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

Solving Approach