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C++ program to reverse a number

mahmoud2506
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2022-05-04
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C++ program to reverse a number

In this program, we will learn how to reverse an integer number in C++?

Here, we will read an integer number through the keyboard and print its reverse number, let suppose input number is "16789", program will print "98761".

Extras:

  1. Declaring integer variable num (to store input number) and sum (to store reverse number) as long integer so that we can input and reverse a large value [Read long integer and its value range].
  2. Checking that input number is positive or not, if it is negative program will be terminated.
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mahmoud2506
2022-05-04
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Reverse an integer number in C++

#include <iostream>
using namespace std;

int main()
{
	long int num,sum;
	int digit;
	
	//input integer number
	cout<<"Enter an integer number: ";
	cin>>num;
	
	//check validation
	if(num<0)
	{
		cout<<"Input positive number!!!"<<endl;
		return -1;
	}
	
	//Reverse number
	sum=0;
	while(num>0)
	{
		digit=num%10;	//get digit
		sum	= (sum*10) + digit;
		num=num/10;
	}
	
	cout<<"Reverse number is: "<<sum<<endl;
	
	return 0;	
}

Output

First run:
Enter an integer number: 16789
Reverse number is: 98761

Second run:
Enter an integer number: -123
Input positive number!!!

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