Ternary operator in C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the ternary operator in C?

The ternary operator is a shorthand way to write an if-else statement. It uses the syntax: condition ? expression_if_true : expression_if_false;

beginner

How does the ternary operator work in C?

It evaluates the condition first. If the condition is true, it returns the first expression; if false, it returns the second expression.

beginner

Rewrite this if-else using the ternary operator:<br>

if (a > b) {
  max = a;
} else {
  max = b;
}

Using ternary operator:<br>

max = (a > b) ? a : b;

intermediate

Can the ternary operator be nested in C?

Yes, you can nest ternary operators inside each other, but it can make code harder to read. Example:<br>

result = (a > b) ? a : ((b > c) ? b : c);

beginner

What is a common use case for the ternary operator?

It is often used for simple conditional assignments or returning values in a concise way instead of writing full if-else blocks.

What does the ternary operator syntax look like in C?

A expr1 ? condition : expr2

B if (condition) expr1 else expr2

C condition ? expr1, expr2

D condition ? expr1 : expr2

The ternary operator uses the syntax: condition ? expression_if_true : expression_if_false.

What value does the ternary operator return if the condition is false?

A The first expression

B The condition itself

C The second expression

D It returns nothing

If the condition is false, the ternary operator returns the second expression after the colon.

Which of these is a correct use of the ternary operator?

A max = if (a > b) a else b;

B max = (a > b) ? a : b;

C max = (a > b) : a ? b;

D max = a > b ? : b;

Option B correctly uses the ternary operator syntax.

Is it recommended to use nested ternary operators?

A Yes, but they can reduce readability

B No, they are not allowed

C Yes, always for clarity

D No, they cause syntax errors

Nested ternary operators are allowed but can make code harder to read.

What is a benefit of using the ternary operator?

A It simplifies simple conditional assignments

B It replaces loops

C It is slower than if-else

D It makes code longer

The ternary operator simplifies writing simple conditional assignments in a concise way.

Explain how the ternary operator works and write a simple example in C.

Think of it as a short if-else that returns a value.

Describe when you might prefer using the ternary operator instead of a full if-else statement.

Use it when you want to assign a value quickly based on a condition.