🚀⚡Beginner

Swap Two Numbers

Swap values using temp variable

Swapping means exchanging the values of two variables. This is a fundamental operation used in sorting algorithms, data manipulation, and many other programming scenarios.

🔄 Why Learn Swapping?

•Essential for sorting algorithms (Bubble Sort, Selection Sort)
•Used in array manipulation
•Fundamental concept in data structures

Method 1: Using Temporary Variable

swap_temp.c

1#include <stdio.h>
2
3int main() {
4    int a = 10, b = 20, temp;
5    
6    printf("Before: a = %d, b = %d\n", a, b);
7    
8    // Swap using temp variable
9    temp = a;    // temp = 10
10    a = b;       // a = 20
11    b = temp;    // b = 10
12    
13    printf("After:  a = %d, b = %d\n", a, b);
14    return 0;
15}

Output

Before: a = 10, b = 20

After: a = 20, b = 10

Step-by-Step Execution:

temp = a

Store value of a (10) in temp. Now: a=10, b=20, temp=10

a = b

Copy value of b to a. Now: a=20, b=20, temp=10

b = temp

Copy temp to b. Now: a=20, b=10, temp=10

Method 2: Without Temporary Variable

swap_arithmetic.c

1#include <stdio.h>
2
3int main() {
4    int a = 10, b = 20;
5    
6    printf("Before: a = %d, b = %d\n", a, b);
7    
8    // Swap without temp (arithmetic method)
9    a = a + b;   // a = 30
10    b = a - b;   // b = 10
11    a = a - b;   // a = 20
12    
13    printf("After:  a = %d, b = %d\n", a, b);
14    return 0;
15}

Note: The arithmetic method can cause overflow with very large numbers. The temp variable method is safer and more readable.

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