`assignment-s-07.c`¶

Problem Statement

Write a program to swap two numbers using a macro (#define).

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Beginner (index: 0 / 10)

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Source Code¶

#include <stdio.h>

// Define the SWAP macro.
// The do-while(0) block is a common trick to ensure the macro behaves
// like a single statement, regardless of where it is used (e.g., inside an 'if' statement).
#define SWAP(a, b, data_type)   \
    do {                        \
        data_type temp = a;     \
        a = b;                  \
        b = temp;               \
    } while(0)

int main() {
    int num1 = 15;
    int num2 = 42;

    printf("--- Before Swap ---\n");
    printf("Number 1 (num1): %d\n", num1);
    printf("Number 2 (num2): %d\n", num2);

    // Call the macro, passing the variables and their type
    // The preprocessor replaces this line with the block of code defined above.
    SWAP(num1, num2, int);

    printf("\n--- After Swap (using macro) ---\n");
    printf("Number 1 (num1): %d\n", num1);
    printf("Number 2 (num2): %d\n", num2);

    return 0;
}

Explanation¶

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    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

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    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

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    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

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    [END]

    CODE (assignment-s-07.c):

    #include <stdio.h>

    // Define the SWAP macro.
    // The do-while(0) block is a common trick to ensure the macro behaves
    // like a single statement, regardless of where it is used (e.g., inside an 'if' statement).
    #define SWAP(a, b, data_type)   \
        do {                        \
            data_type temp = a;     \
            a = b;                  \
            b = temp;               \
        } while(0)

    int main() {
        int num1 = 15;
        int num2 = 42;

        printf("--- Before Swap ---\n");
        printf("Number 1 (num1): %d\n", num1);
        printf("Number 2 (num2): %d\n", num2);

        // Call the macro, passing the variables and their type
        // The preprocessor replaces this line with the block of code defined above.
        SWAP(num1, num2, int);

        printf("\n--- After Swap (using macro) ---\n");
        printf("Number 1 (num1): %d\n", num1);
        printf("Number 2 (num2): %d\n", num2);

        return 0;
    }

assignment-s-07.c¶