Bit Operations using Macros

Code

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

#define Setbit2(r)      ((r) |= (1U << 2))
#define Setbit7(r)      ((r) |= (1U << 7))
#define clearbit3(r)    ((r) &= ~(1U << 3))
#define togglebit5(r)   ((r) ^= (1U << 5))

uint8_t modify_register(uint8_t reg) {
    Setbit2(reg);
    Setbit7(reg);
    clearbit3(reg);
    togglebit5(reg);
    return reg;
}

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

Solving Approach