Bit Operations using Macros

Code

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

# define set(r,b) (r |= (1<<b))
# define clear(r,b) (r &= ~(1<<b))
# define toggle(r,b) (r ^= (1<<b))

uint8_t modify_register(uint8_t reg) {
    set(reg,2);
    set(reg,7);
    clear(reg,3);
    toggle(reg,5);
    return reg;
}

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

Solving Approach