Writing your First C Program

There are some steps to write the First Program in C Language

1. Install a C Compiler

Before you start writing C programs, you need to install a C compiler. If you did not install then please check my last article for How to install C Compiler on your machine.

2. Create Your First Program

Once you have the compiler installed, you can create your first program. Let’s write a basic “Hello, techfliez.com!” program.

Example:


#include <stdio.h>  // Preprocessor directive to include standard input/output header file

int main() {
    printf("Hello, techfliez.com!");  // Prints "Hello, techfliez.com!" to the console
    return 0;  // Exit the program successfully
}

Explanation of the Code:

#include<stdio.h>: This tells the compiler to include the standard input/output library that allows us to use functions like printf.

int main(): This is the entry point of every C program. The program starts executing here.

printf(“Hello, techfliez.com!”);: This line prints the message Hello, techfliez.com! to the screen.

return 0;: This indicates that the program has successfully completed and returns control to the operating system.

3. Save and Compile the Program

1. Save the program in a file with the .c extension, for example, hello.c.

2. Now, open a terminal/command prompt and navigate to the directory where your program is saved.

3. To compile the program, use the following command (assuming you’re using GCC).


gcc hello.c -o hello

This will create an executable file called hello (or hello.exe on Windows).

4. Run the Program

After compilation, you can run your program:

On Linux/macOS:


./hello

On Windows:


hello

Output:

Hello, techfliez.com!

Writing your First C Program – Interview Questions

Q 1: What is the basic structure of a C program?
Ans: It includes header files, main() function, variable declarations, and statements.
Q 2: Why is main() function important?
Ans: Execution of a C program starts from the main() function.
Q 3: What does #include do?
Ans: It includes standard input-output functions like printf() and scanf().
Q 4: What is printf() used for?
Ans: printf() is used to display output on the screen.
Q 5: What does return 0; indicate in a C program?
Ans: It indicates successful execution of the program.

Writing your First C Program – Objective Questions (MCQs)

Q1. Which function is the entry point of a C program?





Q2. Which header file is required for printf()?





Q3. Which symbol is used to end a statement in C?





Q4. What does printf() do?





Q5. Which function is used to take input from user?





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