C++ I/O

C++ I/O stands for "input and output." Input is the way we get data into our programs. Output is how we write out messages to the computer screen. See below for the C++ statements we use for input and output. Oh, by the way, you should also read about I/O in section 1.3 in your text (beginning on page 22).

• Input Statements

• To enter a variable value into the program, we use a cin statement, for example

  cin >> x;          // this line puts the value the user types in the variable x

  cin >> x >> y;  // input values in two variables x and y

• Output Statements
  • To print out text or variables to the screen, we use a cout statement, for example

cout << "hello\n";    // this line prints the word hello to the screen

cout << x << endl;  // prints the value of the variable x to the screen with a <CR>