IT1120 - Intro to Programming Lecture 4

Questions and Answers

What is the primary purpose of an IF statement in programming?

To check a condition and execute code based on the result (correct)

To execute code unconditionally

To declare variables

To repeat a sequence of instructions

The sequence and selection statements in programming are completely independent of each other.

False

What happens if the condition in an IF statement evaluates to false?

The code block following the IF statement is skipped.

In programming, we make decisions based on certain ________.

conditions Signup and view all the answers

Match the following terms with their definitions:

IF Statement = Basic selection statement to check a condition Condition = A specific state or criteria used for decision making Code Block = A section of code executed based on the IF statement Selection = The process of making choices in programming Signup and view all the answers

Which operator can be used as a shorthand for an if-else statement in Java?

Ternary operator Signup and view all the answers

A break statement is required in a switch statement to exit after executing a case.

True Signup and view all the answers

What is the primary purpose of a switch statement in programming?

To compare a value against multiple constant expressions and execute code based on the match. Signup and view all the answers

The _____ operator allows for a concise way to implement conditional expressions in Java.

ternary Signup and view all the answers

Match the following programming constructs to their descriptions:

Switch Statement = Compares a value against multiple cases Ternary Operator = Shortened form of if-else condition Break Statement = Exits a switch case Pseudocode = Notational system for designing algorithms Signup and view all the answers

What is the purpose of curly braces in an IF statement?

To define the body of the if statement Signup and view all the answers

An IF statement can have only one statement in its body, with no braces required.

False Signup and view all the answers

What is the main difference between IF and IF ELSE statements?

IFONLY runs one block if true; IF ELSE has two blocks for true and false conditions. Signup and view all the answers

The __________ IF statement allows checking of multiple conditions.

ELSE IF Signup and view all the answers

Match the following statements with their descriptions:

IF statement = Checks a condition and executes code if true IF ELSE statement = Checks a condition and executes code if true, otherwise does something else ELSE IF statement = Allows checking multiple conditions sequentially Flow chart = Visual representation of a process or algorithm Signup and view all the answers

In the exercise to compare two integers, what is the expected output if they are equal?

The two integers are equal. Signup and view all the answers

It is necessary to use both a pseudocode and a flow chart for every programming scenario.

False Signup and view all the answers

What programming language is used in the exercise for inputting integers?

Java Signup and view all the answers

Study Notes

Selection Statements

Selection statements allow decision-making in programming, reflecting real-world choices based on conditions.
The process involves alternative steps depending on given conditions, combining selection with sequence in problem-solving.

Types of Selection Statements

IF Statement:
- Basic structure used to check a condition.
- Executes the following code block if the condition is true; skips it if false.
- Enclose multiple statements in braces {} to form a block.
IF ELSE Statement:
- Expands the IF statement by providing two code execution paths depending on the condition's truth value.
ELSE IF Statement:
- Allows checking multiple conditions sequentially, offering several potential outcomes based on user input.
Switch Statement:
- Compares a variable against a set of constant values (cases).
- Executes the associated code block for the matching case; typically uses a break statement to exit after execution.

Ternary Operator

The ternary operator (?:) is a shorthand for the IF-ELSE statement, allowing for concise conditional expressions in a single line.

Practical Exercises

Input integers to check for equality, with pseudocode, flowchart, and Java program required for implementation.
Ice cream flavor purchase scenario focusing on user input for displaying results, also requiring pseudocode and Java program development.

Syntax Notes

Use of braces {} is essential for encapsulating multiple statements within conditional structures.
Conditions and case expressions are critical for the execution flow in programming logic.

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Description

This quiz covers the key concepts of sequence and selection statements in programming, as introduced in IT1120 - Introduction to Programming. Students will explore how these concepts relate to making decisions in coding. Prepare to test your understanding of basic programming logic and structures.