What will happen when the following code is run as a program, the normal way (not evaluated on an interactive console)?

400 / 2

Select one answer, then check.

• A value will be computed, but nothing will be printed in the console.
  Correct. 400 / 2 is evaluated to 200.0, but since there is no print, the result is thrown away and nothing appears in the console.
• The program will crash because the syntax is not valid.
  Not quite. 400 / 2 is completely valid Python syntax — it's just an expression.
• The program will crash because the semantics are not valid.
  Not quite. Dividing two numbers is a perfectly valid operation; nothing here is semantically wrong.
• A value will be computed, and printed on the console.
  Not quite. Without a print statement, running this as a saved program does not show the result anywhere.

Now imagine typing the very same expression directly into an interactive console (a REPL), instead of running it as a program. What happens?

400 / 2

Dodona itself has no interactive console — this checks the concept from the reading. Select one answer, then check.

• A value will be computed, and printed on the console.
  Correct. An interactive console evaluates the expression and automatically shows you the result, with no print needed.
• The program will crash because the syntax is not valid.
  Not quite. The expression is valid Python; nothing here would cause a syntax error.
• The program will crash because the semantics are not valid.
  Not quite. Dividing two numbers is a valid operation.
• A value will be computed, but nothing will be printed in the console.
  Not quite — that's what happens when you run this as a saved program. An interactive console shows the value automatically.

Which of the following statements are true about the interactive console?

Select every true statement, then check.

• You must use print to make text appear on the console from a program.
  True. A program does not display the value of an expression on its own, so you need print to show it. An input prompt is written to the console too, but that is the prompt, not the value of an expression.
• You do not need to use print to make text appear when you evaluate an expression from the interactive console.
  True. On an interactive console, evaluating an expression shows its value automatically, without needing print.
• Every expression evaluated in a program will be printed on the console, by default.
  False. Running a saved program does not automatically print every expression's value — only what's explicitly passed to print appears.
• Every program must print, otherwise the program will not run.
  False. A program with no print calls at all still runs from start to finish; it simply produces no console output.