while loop in c++

A while loop in C++ programming repeatedly executes a target statement as long as a given condition is true.
Its called a loop because control keeps looping back to the start of the statement until the test becomes false.
The loop iterates as long as the defined condition is true. When it ceases to be true and becomes false, control passes to the first line after the loop.
The reserved word while begins the while statement.
The Boolean expression condition determines whether the body will be (or will continue to be) executed. The expression must be enclosed within parentheses as shown.
The statement is the statement to be executed while the Boolean expression is true. The statement makes up the body of the while statement.

Syntax

while(condition)
  {
     statements(s);
  }

Flow Diagram

Example

#include using namespace std;

int main()
{
 int n = 99; // make sure n isn’t initialized to 0

 while( n != 0 ) // loop until n is 0
    cin >> n; // read a number into n
  cout << endl;
  return 0;
}

Output