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C++ || Snippet – How To Reverse An Integer Using Modulus & While Loop

March 15, 2012 admin No comments

This page will consist of a simple program which demonstrates how to reverse an integer (not an int array) using modulus and a while loop.

REQUIRED KNOWLEDGE FOR THIS SNIPPET

Functions Modulus While Loops





		
		
			Reversing An Integer
			
C++
			
			#include <iostream>
using namespace std;

// function prototype
int ReverseNumber(int number);

int main()
{
	// declare variables
	int number = 0;
	int numReversed = 0;

	// get data from user
	cout << "Enter a number: ";
	cin >> number;

	// function call which will return the reversed number
	numReversed = ReverseNumber(number);

	// display new data to user
	cout <<endl<< number << " reversed is: "<< numReversed <<endl;

	return 0;
}// end of main

int ReverseNumber(int number)
{
	// declare function variable
	int rev=0;

	while(number > 0)
	{
		rev = rev * 10 + (number % 10);
		number = number/10;
	}

	return rev;
}// http://programmingnotes.org/
			
				
					
				
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						#include <iostream>
using namespace std;
 
// function prototype
int ReverseNumber(int number);
 
int main()
{
	// declare variables
	int number = 0;
	int numReversed = 0;
 
	// get data from user
	cout << "Enter a number: ";
	cin >> number;
 
	// function call which will return the reversed number
	numReversed = ReverseNumber(number);
 
	// display new data to user
	cout <<endl<< number << " reversed is: "<< numReversed <<endl;
 
	return 0;
}// end of main
 
int ReverseNumber(int number)
{
	// declare function variable
	int rev=0;
 
	while(number > 0)
	{
		rev = rev * 10 + (number % 10);
		number = number/10;
	}
 
	return rev;
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output
(Note: the code was compiled three separate times to display different output)

==== RUN #1 ====
Enter a number: 2012 2012 reversed is: 2102 ==== RUN #2 ==== Enter a number: 1987 1987 reversed is: 7891 ==== RUN #3 ====
Enter a number: 241 241 reversed is: 142

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C++ || Snippet – How To Reverse An Integer Using Modulus & While Loop

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