Bit Operations using Macros

Code

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

// Bitwise macros
#define SET_BIT(reg, pos)     ((reg) |=  (1U << (pos)))
#define CLEAR_BIT(reg, pos)   ((reg) &= ~(1U << (pos)))
#define TOGGLE_BIT(reg, pos)  ((reg) ^=  (1U << (pos)))

uint8_t modify_register(uint8_t reg) {
    // 1. Set bits 2 and 7
    SET_BIT(reg, 2);
    SET_BIT(reg, 7);

    // 2. Clear bit 3
    CLEAR_BIT(reg, 3);

    // 3. Toggle bit 5
    TOGGLE_BIT(reg, 5);

    return reg;
}

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

Solving Approach