freeCodeCamp/guide/english/cplusplus/do-while-loop/index.md

title
do while loop

Do While Loop

The do while loop is almost the same as the while loop. The do while loop has the following form:

do 
{
  // do something;	
} while(expression);
	

Note: Remember to use a semicolon ';' at the end of the condition.

Details about do-while loop

The do-while loop is used whenever you are sure that a particular process(within the loop) has to be performed at least once. It has many advantages like not initialising the checking variable(eg- char addmore='Y') etc. The semicolon at the end of while is a must.

Do something first and then test if we have to continue. The result is that the do block runs at least once. (Because the expression test comes afterward). Take a look at an example:

#include <iostream>
	using namespace std;

	int main()
	{
		int counter, howmuch;

		cin >> howmuch;
		counter = 0;
		do
		{
			counter++;
			cout << counter << '\n';
		}
		while ( counter < howmuch);
		return 0;
	}