Bit Operations using Macros

Code

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

// Define bitwise macros here
#define BIT_SET(reg, n) (reg |= (1 << n))
#define BIT_CLR(reg, n) (reg &= ~(1 << n))
#define BIT_FLP(reg, n) (reg ^= (1 << n))

uint8_t modify_register(uint8_t reg) {
    BIT_SET(reg, 2);
    BIT_SET(reg, 7);
    BIT_CLR(reg, 3);
    BIT_FLP(reg, 5);
    return reg;
}

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

Solving Approach