C Program to find Reverse of a Number using Recursion

The following C program using recursion reverses the digits of the number and displays it on the output of the terminal.Eg: 123 becomes 321.

Here is the source code of the C program to find the reverse of a number. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
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 * C program to find the reverse of a number using recursion

```
 */
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```
#include <stdio.h>
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```
#include <math.h>
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```
 
```
```
int rev(int, int);
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```
 
```
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int main()
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```
{
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    int num, result;
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    int length = 0, temp;
```
```
 
```

    printf("Enter an integer number to reverse: ");

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    scanf("%d", &num);
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    temp = num;
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    while (temp != 0)
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    {
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        length++;
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        temp = temp / 10;
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    }
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    result = rev(num, length);
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    printf("The reverse of %d is %d.\n", num, result);

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    return 0;
```
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}
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```
 
```
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int rev(int num, int len)
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```
{
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    if (len == 1)
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```
    {
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        return num;
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    }
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    else
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    {
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        return (((num % 10) * pow(10, len - 1)) + rev(num / 10, --len));

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    }
```
```
}
```

$ cc pgm34.c
$ a.out
Enter an integer number to reverse: 1234
The reverse of 1234 is 4321.

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