Program for: “Swapping of two numbers in C”

**Problem Statement:** Given two numbers a and b swap the two numbers such that the value of a becomes b and the value of b becomes a.

**Examples:**

Example 1:Input:a = 5 , b = 3Output:b = 3, a = 5Explanation:Swapped two numbersExample 2:Input:a = 6 , b = 7Output:b = 7, a = 6Explanation:Swapped two numbers

**Solution:**

** Disclaimer**:

*Don’t jump directly to the solution, try it out yourself first.*

**Approach:**

- we are given two variables a and b and we need to swap the values of these variables.
- We take a temporary variable temp.
- we store the value of a in temp.
- Then store the value of b in a.
- Then store the value of temp in b and we have the numbers swapped.

## C Program

```
#include <stdio.h>
int main() {
int a = 5, b = 3, temp;
printf("Before swapping a=%d and b=%d\n",a,b);
// swapping values
temp = a;
a = b;
b = temp;
printf("After swapping a=%d and b=%d",a,b);
}
```

**Output:**

Before swapping a=5 and b=3

After swapping a=3 and b=5

**Time Complexity:** O(1)

You can also convert the above program to create a custom swap function which will swap the values passed in as parameters. Below is the code for the same.

## C Program

```
#include <stdio.h>
int swap(int *a,int *b) {
int temp = *a;
*a = *b;
*b = temp;
}
int main() {
int a = 5, b = 3;
printf("Before swapping a=%d and b=%d\n",a,b);
swap(&a,&b);
printf("After swapping a=%d and b=%d",a,b);
}
```

**Output:**

Before swapping a=5 and b=3

After swapping a=3 and b=5

**Time Complexity:** O(1)

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