Topic 3.3 and 3.4: Using Operators and Decision Constructs - Create if and if/else and ternary constructs and use a switch statement

Question 1

What is a
switch statement?

Answer 1

This provides a way to execute different blocks of code based on the value of a variable or an expression.

Question 2

What is the
ternary operator?

Answer 2

This operator is a concise way to write if/else statements in a single line.

Question 3

What is the syntax of a switch statement?

Answer 3

Syntax:

switch (variable) {
    case value1:
        // Code to be executed if variable equals value1
        break;
    case value2:
        // Code to be executed if variable equals value2
        break;
    // Additional case statements
    default:
        // Code to be executed if variable doesn't match any case
        break;
}

Question 4

What is the syntax of the
ternary operator?

Answer 4

Syntax is:

variable = (condition) ? expression1 : expression2;

Question 5

What is the purpose of the break statement in a switch statement?

Answer 5

The break statement is used to prevent fall-through behavior, where execution continues to the next case even if a match is found.

Question 6

What types of data can be used with a switch statement?

Answer 6

A switch statement works with the:

• byte, short, char, and int primitive data types.
• It also works with enumerated types, the String class,
• and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer.

Question 7

How does a switch statement work?

Answer 7

The switch statement evaluates the value of the variable and matches it with the values specified in the case statements.

If a match is found, the corresponding code block is executed until a break statement is encountered, which exits the switch statement.

If no match is found, the code block associated with the default statement is executed (if provided).

Question 8

How does the ternary operator work?

Answer 8

The condition is evaluated first. If it is true, expression1 is assigned to the variable; otherwise, expression2 is assigned.

variable = (condition) ? expression1 : expression2;