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Ruby program to find the reverse of a given number using recursion

Last Updated : December 15, 2025

Problem Solution

In this program, we will read an integer number from the user and find the reverse of the input number using recursion.

Program/Source Code

The source code to find the reverse of a given number using recursion is given below. The given program is compiled and executed successfully.

# Ruby program to find the reverse of 
# given number using recursion

def reverse(num,rev)
	if num > 0 
	    rem = (num % 10);
		rev = rev*10+rem;
		reverse(num / 10,rev);
	else
	    return rev;    
	end
end

print "Enter number: ";
number = gets.chomp.to_i;  

result = reverse(number, 0);
print "Result is: ",result;

Output

Enter number: 1234
Result is: 4321

Explanation

In the above program, we read an integer number from the user. Then we found the reverse of the input number using recursive function reverse(). Then we printed the result.

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