Bit Operations using Macros

Code

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

#define setbit(reg, pos) reg = reg | (1 << pos)
#define clrbit(reg, pos) reg = reg & ~(1 << pos)
#define togbit(reg, pos) reg = reg ^ (1 << pos)

uint8_t modify_register(uint8_t reg) {
    setbit(reg, 2);
    setbit(reg, 7);
    clrbit(reg, 3);
    togbit(reg, 5);
    return reg;
}

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

Solving Approach