Bit Operations using Macros

Code

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

#define BIT_SET(reg, pos)     ((reg) |= (1 << (pos)))
#define BIT_CLEAR(reg, pos)   ((reg) &= ~(1 << (pos)))
#define BIT_TOGGLE(reg, pos)  ((reg) ^= (1 << (pos)))

uint8_t modify_register(uint8_t reg) {
    BIT_SET(reg, 2);
    
    BIT_SET(reg, 7);

    BIT_CLEAR(reg, 3);

    BIT_TOGGLE(reg, 5);

    return reg;
}

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

Solving Approach