Scope of variables - Mini Project: Build & Apply

Scope of variables in C

📖 Scenario: Imagine you are writing a small C program to understand how variables behave inside and outside functions.

🎯 Goal: You will create a program that shows how variables declared inside a function are different from variables declared outside it.

📋 What You'll Learn

Create a global variable named count with value 10

Create a function named showCount that declares a local variable named count with value 5

Inside showCount, print the local count

Outside the function, print the global count

💡 Why This Matters

🌍 Real World

Understanding variable scope helps avoid bugs when different parts of a program use the same names.

💼 Career

Knowing scope is essential for writing clear and correct code in any programming job.

1

Create a global variable

Create a global integer variable called count and set it to 10.

C

# Your code here

Need a hint?

Global variables are declared outside any function.

2

Create a function with a local variable

Create a function named showCount that declares a local integer variable called count and sets it to 5.

C

int count = 10;
// Your code here

Need a hint?

Local variables are declared inside functions.

3

Print the local variable inside the function

Inside the showCount function, add a printf statement to print the local count variable with the text "Local count: %d\n".

C

int count = 10;

void showCount() {
    int count = 5;
    // Your code here
}

Need a hint?

Use printf to show the value of the local variable.

4

Print the global variable outside the function

In the main function, call showCount() and then print the global count variable with the text "Global count: %d\n" using printf.

C

int count = 10;

#include 

void showCount() {
    int count = 5;
    printf("Local count: %d\n", count);
}

int main() {
    // Your code here
    return 0;
}

Need a hint?

Call the function first, then print the global variable.