While Loop Statement in C++

In C++ while loop is first check the condition, if condition is true then control goes inside the loop body, other wise goes outside the body.

while (condition test){
      //Statements to be executed repeatedly 
      // Increment (++) or Decrement (--) Operation
}

Example:-

#include <iostream>  
using namespace std;  
int main() {         
 int i=1;      
         while(i<=5)   
       {      
            cout<<i <<"\n";    
            i++;  
          }       
    }  

Output:

Nested While Loop Statement in C++

Example:-

#include <iostream>
using namespace std;
                                            
int main() {
                                            
   int rows, i = 1;
   cout << "Enter the number of rows: ";
   cin >> rows;

   while (i <= rows) {
        int j = 1;
      while(j <= i) {
         cout << i;
         j++;
      }
    cout << "\n";
    i++;
   }
    return 0;
}

Output:

Enter the number of rows: 5
1
22
333
4444
55555

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