If statement in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

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

An if statement lets the program decide to run some code only if a condition is true. It's like choosing a path based on a yes/no question.

beginner

Write the basic syntax of an if statement in C++.

The basic syntax is:<br>

if (condition) {<br>  // code to run if condition is true<br>}

beginner

What happens if the condition in an if statement is false?

If the condition is false, the code inside the if block is skipped and the program continues with the next part.

beginner

How do you add an alternative action if the if condition is false?

You use an else block after the if. It runs when the if condition is false.<br>

if (condition) {<br>  // if true<br>} else {<br>  // if false<br>}

intermediate

Can you check multiple conditions in C++? How?

Yes, by using else if blocks between if and else. It checks conditions one by one until one is true.<br>

if (cond1) {<br>} else if (cond2) {<br>} else {<br>}

What does this code print?<br>

int x = 5;<br>if (x > 3) {<br>  std::cout << "Yes";<br>} else {<br>  std::cout << "No";<br>}

A Error

B Yes

C Nothing

D No

Since 5 is greater than 3, the condition is true, so it prints "Yes".

Which keyword is used to provide an alternative when an if condition is false?

A else

B elif

C otherwise

D switch

In C++, else is used to run code when the if condition is false.

What will happen if the if condition is false and there is no else block?

A The code inside <code>if</code> is skipped

B The program will crash

C The code inside <code>if</code> runs anyway

D The program asks for input

If the condition is false and no else is present, the program skips the if block and continues.

How do you check multiple conditions in sequence?

A Using <code>for</code> loops

B Using multiple <code>if</code> statements without <code>else</code>

C Using <code>switch</code> only

D Using <code>else if</code> blocks

else if lets you check several conditions one after another.

Which of these is a valid if condition in C++?

A if x > 5 then { }

B if x > 5 { }

C if (x > 5) { }

D if (x > 5) then { }

In C++, conditions must be inside parentheses after if.

Explain how an if statement controls the flow of a program.

Think about making choices based on yes/no questions.

Describe the difference between if, else if, and else in C++.

Imagine checking multiple doors until one opens.