Bit Operations using Macros

Code

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

// Define macros for bit operations
#define SET_BIT(REG, POS)     ((REG) |=  (1U << (POS)))
#define CLEAR_BIT(REG, POS)   ((REG) &= ~(1U << (POS)))
#define TOGGLE_BIT(REG, POS)  ((REG) ^=  (1U << (POS)))
#define CHECK_BIT(REG, POS)   (((REG) >> (POS)) & 1U)

uint8_t modify_register(uint8_t reg) {
    // Perform the bit operations
    SET_BIT(reg,2);
    SET_BIT(reg,7);    // OR with 130 → set bit7 and bit1
    CLEAR_BIT(reg,3);    // AND with 0xF7 → clear bit3
    TOGGLE_BIT(reg,5);    // XOR with 32  → toggle bit5

    return reg;
}

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

Solving Approach