84: Mainline

The input operator, >>, also known as the extraction operator, is the complement of the output operator.

When used with the cout output-place specification, the output operator displays the value of an expression on your screen. When used with the cin input-place specification, the input operator picks up a value for a variable by watching what you type on your keyboard. In the following program, for example, each input expression picks up an integer and assigns that integer to a variable:

#include 
main ( ) {
  int height, width, length;
  cout << "Please type three integers." << endl;
  cin >> height;  
  cin >> width;   
  cin >> length;  
  cout << "The volume of a " 
       << height << " by " << width << " by " << length 
       << " box car is " << height * width * length << endl; 
}