Bit Operations using Macros

Code

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

// Define bitwise macros here
#define SET(n)    ((n) | (1u << 7) | (1u << 2))
#define CLR(n)    ((n) & ~(1u << 3))
#define TGL(n)    ((n) ^ (1u << 5)) 

uint8_t modify_register(uint8_t reg) {
    reg = SET(reg);
    reg = CLR(reg);
    reg = TGL(reg);
    return reg;
}

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

Solving Approach