Bit Operations using Macros

Code

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

// Define bitwise macros for maintainability
#define SET_BIT(reg, bit)    ((reg) |= (1U << (bit)))
#define CLEAR_BIT(reg, bit)  ((reg) &= ~(1U << (bit)))
#define TOGGLE_BIT(reg, bit) ((reg) ^= (1U << (bit)))

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;
    // Using %hhu to read an 8-bit unsigned integer
    if (scanf("%hhu", &reg) == 1) {
        printf("%u", modify_register(reg));
    }
    return 0;
}

Solving Approach