Bit Operations using Macros

Code

#include <stdio.h>
#include <stdint.h>
#define set1 (reg|1<<2)
#define set2 (reg|1<<7)
#define clc (reg& ~(1<<3))
#define to (reg^(1<<5))

uint8_t modify_register(uint8_t reg) {
    reg =set1;
    reg=set2;
    reg=clc;
    reg=to;
    return reg;
}

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

Solving Approach