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 helps the program make choices.

beginner

Write the basic syntax of an if statement in C.

The basic syntax is:<br>

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

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 after the block.

beginner

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

You use an else block after the if block:<br>

if (condition) {
    // code if true
} else {
    // code if false
}

intermediate

Can you have multiple conditions checked in sequence? How?

Yes, by using else if blocks between if and else to check more conditions one after another.

What does the if statement do in C?

A Repeats code multiple times

B Ends the program

C Defines a new variable

D Runs code only if a condition is true

The if statement runs code only when its condition is true.

Which symbol is used to compare equality in an if condition?

A ==

B =

C !=

D &&

Double equals == checks if two values are equal.

What happens if the if condition is false and there is no else?

A The program crashes

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

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

D The program asks for input

If the condition is false, the if block is skipped.

How do you check multiple conditions in order?

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

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

C Using a <code>switch</code> statement only

D Using a loop

You use else if blocks to check multiple conditions in sequence.

Which of these is a correct if statement in C?

A if (x == 5) { }

B if (x = 5) { }

C if x = 5 { }

D if x == 5 then { }

The correct syntax uses parentheses and double equals: if (x == 5) { }.

Explain how an if statement works in C and write a simple example.

Think about how you decide to do something only if a condition is met.

Describe how to handle two different actions based on a condition using if and else.

Imagine choosing between two paths depending on a yes/no question.