

A **`do-while` loop** in C++ is similar to the `while` loop. Just as in a `while` loop, a `do-while` loop also has a condition which determines when the loop will break.

# While vs. do-while loop

The only difference between a `do-while` and a `while` loop is that in the former the condition is evaluated once the code in the loop body has executed and in the latter, the condition is evaluated *before* the code in the loop body is executed.

## Syntax
In a `do-while` loop, the `do` keyword is followed by curly braces `{ }` containing the code statements. Then the *condition* is specified for the `while` loop. 


do {
  //code statement(s)
} while(condition);

> **Note**: Do not forget the `;` after `while` towards the end

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## Example

Let's have a look at the `do-while` loop syntax in C++, using an example.

#include <iostream>
using namespace std;

int main() {
  int x = 10;
   do {
     cout << "X = " << x << endl;
      x++;
   } while(x < 20);
  return 0;
}

How does a do-while loop work in C++?

In a do-while loop, the condition is checked after executing the loop body.