Bit Operations using Macros

Code

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

// Macros
#define SET_BIT(reg, n)     ((reg) |=  (1 << (n)))
#define CLEAR_BIT(reg, n)   ((reg) &= ~(1 << (n)))
#define TOGGLE_BIT(reg, n)  ((reg) ^=  (1 << (n)))

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

    // Step 2: Clear bit 3
    CLEAR_BIT(reg, 3);

    // Step 3: Toggle bit 5
    TOGGLE_BIT(reg, 5);

    return reg;
}

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

Solving Approach

 

 

 

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Expected Output

164