Boolean Expressions If Statements and Control Flow If-Else Statements Code Example Hacks Quiz

Unit 3 Boolean Expressions - 3.1

Unit 3 Team Teach

• • 1 min read

AP CSA

3.1 Boolean Expressions

Java’s relational operators

  • equal to: ==
  • not equal to: !=
  • less than: <
  • greater than: >
  • less than or equal to: <=
  • greater than or equal to >=

Hack!

int myAge = 15;
int otherAge = 45;

using these integers, determine weather the following statements are True or False

Screenshot 2024-09-15 at 10 00 54 PM

Strings

popcorn hack

whats wrong with this code? (below)


String myName = Alisha;

myName != Anika;
myName == Alisha ;

|   String myName = Alisha;

cannot find symbol

  symbol:   variable Alisha

No quotation marks for string

comparison of string objects should be done using String methods, NOT integer methods.

  • .equal
  • compare to
String myName = "Alisha";
boolean areNamesEqual = myName.equals("Alisha");  

if (areNamesEqual) {
    System.out.println("True");
} else {
    System.out.println("False");
}


True

homework question

Screenshot 2024-09-16 at 8 05 24 AM what is the precondition for num?

The number of digits in num is between one and six, inclusive. This means that num must have at least 1 digit and at most 6 digits.

num must be greater than or equal to 0. This means that num cannot be negative.