Bit Operations using Macros

Code

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

#define SET_bits(reg,bit) (reg |= (1<<bit))
#define CLR_bits(reg,bit) (reg &= ~(1<<bit))
#define TOGGLE(reg,bit) (reg ^=(1<<bit))

uint8_t modify_register(uint8_t reg) {
    SET_bits(reg,2);
    SET_bits(reg,7);
    CLR_bits(reg,3);
    TOGGLE(reg,5);
    return reg;
}

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

Solving Approach