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Write a C Program to find Reverse of Number using Recursion

robaa
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2022-11-24
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Write a C Program to find Reverse of Number using Recursion. Here’s simple Program to find Reverse of Number using Recursion in C Programming Language.

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robaa
2022-11-24
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Recursion : :

  • Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
  • The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
  • Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Problem : :

The following C program using recursion reverses the digits of the number and displays it on the output of the terminal.

 
 

Example : : Reverse of 12345  is 54321.

Below is the source code for C Program to find Reverse of Number using Recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to find Reverse of Number using Recursion  */


#include <stdio.h>
#include <math.h>
 
int rev(int, int);
 
int main()
{
    int num, result;
    int length = 0, temp;
 
    printf("Enter an integer number to reverse: ");
    scanf("%d", &num);
    temp = num;
    while (temp != 0)
    {
        length++;
        temp = temp / 10;
    }
    result = rev(num, length);
    printf("The reverse of %d is %d.\n", num, result);
    return 0;
}
 
int rev(int num, int len)
{
    if (len == 1)
    {
        return num;
    }
    else
    {
        return (((num % 10) * pow(10, len - 1)) + rev(num / 10, --len));
    }
}

Output : :

***************** OUTPUT ********************


***************** FIRST RUN *****************

Enter an integer number to reverse: 1234

The reverse of 1234 is 4321.



***************** SECOND RUN *****************

Enter an integer number to reverse: 42967

The reverse of 42967 is 76924.

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C Recursion Solved Programs – C Programming
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