If–else statement in C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of an if–else statement in C?

An if–else statement lets the program choose between two paths: one if a condition is true, and another if it is false.

beginner

Write the basic syntax of an if–else statement in C.

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

beginner

What happens if the condition in an if statement is false and there is no else block?

The program skips the if block and continues with the next code after it, doing nothing inside the if block.

intermediate

Can you have multiple else if blocks in C? What is their purpose?

Yes, multiple else if blocks let you check several conditions one after another, running the code for the first true condition.

beginner

Explain with an example how if–else helps in decision making.

Example: if (score >= 50) { printf("Pass\n"); } else { printf("Fail\n"); } This checks if score is 50 or more to print Pass, otherwise prints Fail.

What will the following code print if x = 10? if (x > 5) { printf("Yes"); } else { printf("No"); }

A Error

B No

C Nothing

D Yes

Since 10 is greater than 5, the condition is true, so it prints "Yes".

Which keyword is used to check an additional condition after an if in C?

A else if

B elseif

C elif

D else

In C, the correct keyword is "else if" (two words).

What happens if the condition in an if statement is false and there is no else block?

A Program crashes

B The if block is skipped

C The else block runs

D The program asks for input

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

Which of these is a valid if–else syntax in C?

A if condition then { } else { }

B if condition { } else { }

C if (condition) { } else { }

D if (condition) then { } else { }

In C, conditions must be inside parentheses: if (condition) { } else { }

Can an if statement exist without an else block?

A Yes, else is optional

B No, else is mandatory

C Only if the condition is true

D Only if the condition is false

The else block is optional; you can have just an if statement.

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

Think about how the program chooses what to do next based on a question.

Write a simple if–else statement in C that prints "Even" if a number is even, and "Odd" if it is odd.

Use number % 2 to check if remainder is zero.