Relational Operators in C

🎙️ Introduction

Hello everyone!

In the previous chapter, we studied Arithmetic Operators, which perform mathematical calculations.

Now let me ask you something:

👉 How does a program decide whether a student passed or failed?
👉 How does it check if one number is greater than another?
👉 How does it control loops based on conditions?

The answer is — Relational Operators.

In this chapter, we will clearly understand what...Read More

🔹 Step 1: What Are Relational Operators?

Relational operators are used to compare two values.

They check the relationship between operands and return a result.

The result is always:

True (1)
OR

False (0)

In simple words:

👉 Relational operators compare values and help...Read More

🔹 Step 2: Types of Relational Operators in C

C language provides six relational operators:

1️⃣ Equal to (==)
2️⃣ Not equal to (!=)
3️⃣ Greater than (>)
4️⃣ Less than (<)
5️⃣ Greater than or equal to (>=)
6️⃣ Less than or equal to (<=)

Let us understand each one clearly...Read More

🔹 Step 3: Equal To (==)

The equal-to operator checks whether two values are equal.

Example concept:
If a = 10 and b = 10

Then:
a == b → True

Important:

Do not confuse:
= (Assignment operator)
== (Relational operator)

This is a very common mistake by...Read More

🔹 Step 4: Not Equal To (!=)

This operator checks whether two values are different.

If a = 10 and b = 5

Then:
a != b → True

It returns true when values are...Read More

🔹 Step 5: Greater Than (>)

This operator checks whether the left operand is greater than the right operand.

If a = 10 and b = 5

Then:
a > b → True

Used in conditions like...Read More

🔹 Step 6: Less Than (<)

This operator checks whether the left operand is less than the right operand.

If a = 5 and b = 10

Then:
a < b → True

Commonly used in loops like...Read More

🔹 Step 7: Greater Than or Equal To (>=)

Checks whether the left value is greater than or equal to the right value.

If marks = 40

Then:
marks >= 40 → True

Useful in pass/fail conditions...Read More

🔹 Step 8: Less Than or Equal To (<=)

Checks whether the left value is less than or equal to the right value.

Example:
age <= 18

Used in age-based conditions...Read More

🔹 Step 9: How Relational Operators Work Internally

Relational operators return:

1 → True
0 → False

These values are used by control statements to decide program flow.

For example:

If condition is true (1), the block executes.

If condition is false (0), it does not execute...Read More

🔹 Step 10: Real-Life Example

Imagine a school grading system.

If marks >= 90 → Grade A
If marks >= 75 → Grade B
If marks >= 40 → Pass
If marks < 40 → Fail

All these conditions use relational operators.

Without them, decision-making is impossible...Read More

📌 Summary

In this chapter, we learned:

Relational operators compare two values.

They return:

True (1)

False (0)

The six relational operators are...Read More