Bit Operations using Macros

Code

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

#define set(reg,n) (reg|(1<<n))
#define clear(reg,n) (reg&(~(1<<n)))
#define toggle(reg,n) (reg^(1<<n))

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

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

Solving Approach