Bit Operations using Macros

Code

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

// Define bitwise macros here
#define SET(reg, pos) reg |= (1 << pos)
#define CLEAR(reg, pos) reg &= ~(1 << pos)
#define TOGGLE(reg, pos) reg ^= (1 << pos)

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