🎙️ Introduction
Hello everyone!
In the previous chapters, we learned about variables — how they store data and how their values can change during program execution.
Now let me ask you something:
👉 What if we have a value that should never change?
👉 What if we want to protect a value from being modified...Read More
🔹 Step 1: Basic Meaning of a Constant
A constant is a value that cannot be changed during program execution.
In simple words:
👉 A constant is a fixed value.
Unlike variables, whose values can change, constants rem...Read More
🔹 Step 2: Why Do We Need Constants?
Imagine writing a program where the value of π is used in many calculations.
If we write 3.14 again and again in different places, it becomes difficult to manage.
Now imagine if the value needs to be updated — we would...Read More
🔹 Step 3: Difference Between Variable and Constant
Let us clearly understand the difference.
Variable:
Value can change.
Used for dynamic data.
Example: age, marks, balance.
Constant:
Value cannot change.
Used for fixed data....Read More
🔹 Step 4: Types of Constants in C
In C language, constants are mainly of different types:
1. Numeric Constants
These include:
Integer constants → 10, 25, -100
Floating constants → 3.14, 0.5, -2.7
2. Character Constants
Single character enclosed in single quotes:
'A'
'b'
'5'
3. String Constants
Group of characters enclosed in double quotes...Read More
🔹 Step 5: Defining Constants in C
In C, we can define constants using:
1. const Keyword
This makes a variable constant.
Example concept:
We declare a variable with const, and once assigned, its...Read More
🔹 Step 6: Rules for Constants
Constant values cannot be modified after definition.
Must follow proper data type.
Should be written in uppercase by convention when using...Read More
🔹 Step 7: Real-Life Example
Imagine a school program where passing marks are fixed at 40.
Instead of writing 40 everywhere, we define:
PASS_MARK = 40
Now if passing criteria changes to 35, we only...Read More
🔹 Step 8: Importance of Constants in Programming
Constants are important because:
They protect important values.
They reduce errors.
They improve code readability.
They make programs easier to update...Read More
📌 Summary
In this chapter, we learned:
A constant is a fixed value.
It cannot change during execution.
It improves safety and clarity...Read More
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