Bit Operations using Macros

Code

#include <stdio.h>
#include <stdint.h>
#define set_bit(r,a) r=r|(1<<a);
#define clear_bit(r,a) r=r& ~(1<<a);
#define toggle_bit(r,a) r=r^(1<<a);

uint8_t modify_register(uint8_t reg) {
    set_bit (reg,2);
    set_bit (reg,7);
    clear_bit (reg,3);
    toggle_bit (reg,5);
    return reg;
}

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

Solving Approach