C++ Programming: Control Structures (if, if..else, Switch Statement)

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Questions and Answers

What type of statement is used to incorporate relational operators in C++ programs?

If statement (correct)

Switch statement

While loop

For loop

In C++, what is the purpose of an if statement?

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

To create a class

To loop through a block of code

To define a function

Which part of an if statement must the condition be enclosed in?

Quotes

Parentheses (correct)

Curly braces

Square brackets

What type of comparison is a==d in the context of C++ programming?

Equality comparison Signup and view all the answers

If an if statement contains only one statement following it, when are braces required?

Never required Signup and view all the answers

What is the purpose of the block of code that follows an if statement?

To execute when the condition is true Signup and view all the answers

What type of programs are known as data-driven programs?

Programs where the data dictates what the program does Signup and view all the answers

Which statement is true about data-driven programs?

They use relational operators to control other statements Signup and view all the answers

Why might you not want a computer to print every employee's paycheck for every pay period?

Some employees might be on vacation Signup and view all the answers

What is the purpose of using relational operators in data-driven programs?

To conditionally control other statements Signup and view all the answers

In data-driven programs, what dictates what the program does?

The data being processed Signup and view all the answers

Why is it important for data-driven programs to not execute the same way every time?

To handle different scenarios based on input data Signup and view all the answers

How does C++ behave when the condition in an if statement is False?

It ignores the block and moves on to the next appropriate statement Signup and view all the answers

How would you best summarize the behavior of an if statement in C++?

Execute the block if the condition is True; otherwise, continue executing the program Signup and view all the answers

What is the purpose of using an if statement in C++?

To make a decision based on a condition Signup and view all the answers

When does the block of statements following an if statement execute in C++?

When the decision (the result of the relation) is True Signup and view all the answers

In which scenario does an if statement in C++ not execute the block of statements?

When the condition is False Signup and view all the answers

Study Notes

Relational Operators and Conditional Execution

Relational operators examine literals and variables in a program and operate accordingly
They are used to create decision statements that test relationships and make decisions about which statement to execute next

The if Statement

The if statement is used to incorporate relational operators in C++ programs
It allows for conditional execution, enabling the program to test for a condition and branch to different parts of the code depending on the result
The simplest form of an if statement is: if (condition){ Statements; }
The condition must be enclosed in parentheses and can include any relational comparison
If the condition is True, the block of statements inside the braces executes; otherwise, it is ignored and the program continues to execute the next statement

Data-Driven Programs

Data-driven programs are programs that don't always execute the same way every time
They are controlled by data, which dictates what the program does
Relational operators are used to conditionally control other statements, making it possible to create data-driven programs

How if Statements Work

An if statement can be read as: "If the condition is True, perform the block of statements inside the braces. Otherwise, the condition must be False; so do not execute that block, but continue executing the remainder of the program as though this if statement did not exist."
The block of statements following the if executes only if the condition is True
If the condition is False, C++ ignores the block and executes the next statement in the program

Examples of if Statements

if (bigNumber > smallNumber) { bigNumber = smallNumber; cout << "bigNumber is now smallNumber"; }
if (expression){ statement1; statement2; statement3; }

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Description

Explore the concepts of control structures in C++ programming language including the if statement, if..else statement, and the Switch Statement. Test your understanding with exercises included in the lecture content.