Bit Operations using Macros

Code

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

#define SET_BIT(REG, POS)    ((REG) |= (1 << (POS)))
#define CLEAR_BIT(REG, POS)  ((REG) &= ~(1 << (POS)))
#define TOGGLE_BIT(REG, POS) ((REG) ^= (1 << (POS)))

uint8_t modifyRegister(uint8_t reg) {
    SET_BIT(reg, 2);   // Step 1: Set bit 2
    SET_BIT(reg, 7);   // Step 2: Set bit 7
    CLEAR_BIT(reg, 3); // Step 3: Clear bit 3
    TOGGLE_BIT(reg, 5);// Step 4: Toggle bit 5
    return reg;
}

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

Solving Approach