Bit Operations using Macros

Code

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

#define POS_SET_1 2
#define POS_SET_2 7
#define POS_CLEAR 3
#define POS_TOGGLE 5

uint8_t modify_register(uint8_t reg) {
    reg |= (1 << POS_SET_1);
    reg |= (1 << POS_SET_2);
    reg &= ~(1 << POS_CLEAR);
    reg ^= (1 << POS_TOGGLE);
    return reg;
}

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

Solving Approach