Setting Up the Environment

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Last Updated on: 22nd Oct 2025 20:20:16 PM

Before writing C programs, you need to set up your computer with a C compiler. A compiler converts your code into machine language so your computer can run it.

 

Installing a C Compiler :

There are several C compilers available. Two of the most commonly used are:

 

Option 1: Dev-C++ (Recommended for Beginners)

Dev-C++ 5.11 is a lightweight and user-friendly IDE (Integrated Development Environment) that includes a compiler.

=> Steps to Install:

 

1. Download Dev-C++ 5.11 from a trusted source (like SourceForge).

2. Run the .exe setup file.

3. Follow the installation steps (click "Next" until it's complete).

4. Open Dev-C++ after installation.

 

Note: Dev-C++ uses the MinGW (GCC) compiler internally, which is widely used and supports modern C standards. 

 

Option 2: Turbo C++ (Old But Popular in Schools)

 

Turbo C++ is a DOS-based compiler still used in some educational institutions.

=> Steps to Install:

 

1. Download Turbo C++ (ideally a Windows-compatible version or use DOSBox).

2. Install and run the setup.

3. Use Alt + F9 to compile and Ctrl + F9 to run a program.

 

Note: Turbo C++ is outdated and does not support many modern features. It is not recommended for professional use.

 

Writing and Running Your First C Program 

Once the compiler is installed, follow these steps to write and execute your first program:

 

Step-by-Step (Using Dev-C++):

1. Open Dev-C++

2. Click on File → New → Source File

3. Type the following code:

 

#include <stdio.h>

int main() {
    printf("Hello, World!");
    return 0;
}

 

1. Save the file with a .c extension, e.g., hello.c

2. Click on Execute → Compile & Run or press F11

 

Explanation of the Program:

 

#include <stdio.h>   // Includes standard input-output library

int main() {         // Starting point of the program
    printf("Hello, World!");  // Prints text to screen
    return 0;        // Ends the program
}

 

• #include <stdio.h> – This allows us to use the printf function.

• int main() – The main function where the execution begins.

• printf() – Prints the message to the output screen.

• return 0; – Tells the operating system that the program ended successfully.

 

Congrats! You have successfully written and executed your first C program.

                                                                            

 

 

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