Bit Operations using Macros

Code

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

// Define bitwise macros here
#define SET_2_7(reg)    (reg | 132)
#define CLEAR_3(reg)    (reg & ~(1 << 3))
#define TOGGLE5(reg)    (reg ^ (1 << 5))

uint8_t modify_register(uint8_t reg) {
    // Apply operations in order
    reg = SET_2_7(reg);
    reg = CLEAR_3(reg);
    reg = TOGGLE5(reg);
    return reg;
}

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

Solving Approach