Branching

Branching#

  • ?:

  • if-else

  • switch

Ternary conditional operator ?:#

This is short-hand if-else:

condition ? consequent : alternative

or in other words:

is this condition true ? yes : no

Example#

Example based on the test code of the previous Lunar Lander Control code. The code tests whether the behavior of the lunar lander control is correct dependent on the altitude and thruster values.

// Assume values 
var altitude = 20;
var thruster = true;

var behaviorCorrect = (altitude > 100 && !thruster) ||
                      (altitude is <= 100 and > 0 && thruster) ||
                      (altitude <= 0 && !thruster);
Console.WriteLine(behaviorCorrect ? "✅" : "❌");
// ?: operator saves an if-else statement

Activity 15

Copy the code above and convert the ternary conditional operator to a if-else statement.

Steps:

  • 3 min individually

  • 1 min compare with your partner

switch#

The switch statement

Appendix#

Contents