Relational operators in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are relational operators in C++?

Relational operators compare two values and return true or false depending on the comparison result.

beginner

List the six common relational operators in C++.

The six common relational operators are:<br>1. == (equal to)<br>2. != (not equal to)<br>3. < (less than)<br>4. > (greater than)<br>5. <= (less than or equal to)<br>6. >= (greater than or equal to)

beginner

What is the output of this code?<br>

int a = 5, b = 10;<br>std::cout << (a < b);

The output is 1 because 5 is less than 10, so the expression a < b is true. In C++, true prints as 1.

beginner

How do relational operators help in decision making in C++?

Relational operators are used in conditions to decide which code to run. For example, in an if statement, they check if a condition is true or false to choose the path.

beginner

What is the difference between == and = in C++?

== is a relational operator that checks if two values are equal.<br>= is an assignment operator that sets a value to a variable.<br>Using = instead of == in a condition causes errors or unexpected behavior.

Which operator checks if two values are NOT equal in C++?

A !=

B ==

C <=

D >=

The operator != means 'not equal to' and returns true if values differ.

What does the expression (7 > 3) return in C++?

A false

B 1

C 0

D Error

7 is greater than 3, so (7 > 3) is true, which prints as 1.

Which relational operator means 'less than or equal to'?

A >=

B ==

C <=

D !=

The operator <= means 'less than or equal to'.

What is the result of (5 == 5) in C++?

A false

B 5

C Error

D true

5 equals 5, so (5 == 5) is true.

Which operator is used to assign a value to a variable?

A =

B <

C !=

D ==

The = operator assigns a value to a variable, not to compare.

Explain what relational operators do in C++ and give examples.

Think about how you check if one number is bigger or smaller than another.

Describe how relational operators are used in decision making with if statements.

Imagine deciding what to do based on comparing two things.