Bit Operations using Macros

Code

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

// Define bitwise macros here
#define bit27(reg)  (reg|=(1<<2|1<<7))
#define bit3(reg)   (reg&=~(1<<3))
#define bit5(reg)   (reg^=(1<<5))

uint8_t modify_register(uint8_t reg) {
    // Apply operations in order
    bit27(reg);
    bit3(reg);
    bit5(reg);
    return reg;
}

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

Solving Approach