13. Iteration (while loop) cont.

• 
      int i = 0;
      while ( i < 100 ) {
          cout << i << '\t' << square( i ) << '\n';
          ++i ;    // increment i
      }
  
  

• What it takes to put together:

  
              i  // A loop variable (control variable)
     int i = 0;  // Initialize the control variable
    ( i < 100 )  // A termination criterion;
                 // here, if i<100 is false, terminate
            ++i  // Increment the control variable
    cout << ...  // Something to do for each iteration