Bit Operations using Macros

Code

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

// Define bitwise macros here
#define SET(n) n |= (1 << 2) | (1 << 7)
#define CLEAR(n) n &= ~(1 << 3)
#define TOGGLE(n) n ^= (1 << 5)
uint8_t modify_register(uint8_t reg) {
    // Apply operations in order
    SET(reg);
    CLEAR(reg);
    TOGGLE(reg);
    return reg;
}

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

Solving Approach