Chapter 4 Quick Reference

Chapter 4 Quick Reference

To	Do this	Example
Determine whether two values are equivalent	Use the == or != operator.	answer == 42
Compare the value of two expressions	Use the <, <=, >, or >= operator.	age >= 21
Declare a Boolean variable	Use the bool keyword as the type of the variable.	bool inRange;
Create a Boolean expression that is true only if two other conditions are true	Use the && operator.	inRange = (lo <= number)   &&  (number <= hi);
Create a Boolean expression that is true if either of two other conditions is true	Use the || operator.	outOfRange = (number < lo)    ||  (hi < number);
Run a statement if a condition is true	Use an if statement.	if (inRange)   process();
Run more than one statement if a condition is true	Use a block.	if (seconds == 59) { seconds = 0; minutes++; }
Associate different statements with different values of a controlling expression	Use a switch statement.	switch (current) { case '<':  ... break;  default : ...   break; }