Installing C Compiler Setup Practice Questions with Solutions

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Introduction

Before running a C program, you need a C compiler to convert your source code into an executable program. In this chapter, you will practice the basic steps involved in setting up a C programming environment. The questions cover checking GCC, creating C files, compiling programs, running executables, using compiler options, and identifying simple compilation errors. These examples are designed for beginners who are setting up C for the first time. Installing C Compiler Setup Practice Questions with Solutions to help you build concepts.

Q1. Check Whether GCC Is Installed

Problem Statement

Check whether the GCC compiler is installed and available on your computer.

C Command

Open Command Prompt on Windows or Terminal on Linux/macOS:

gcc --version

Expected Output

You should see GCC version information similar to:

gcc (GCC) 13.2.0

The version number can be different depending on your installation.

Concepts Covered

  • C compiler
  • GCC
  • Command Prompt
  • Terminal
  • Compiler version

Q2. Create a C Source File

Problem Statement

Create a C source file named hello.c and write a simple program that displays a message.

C Program

#include <stdio.h>

int main()
{
    printf("Hello, C Programming!");

    return 0;
}

Save the file as:

hello.c

Expected Output

Hello, C Programming!

Concepts Covered

  • C source file
  • .c extension
  • main()
  • printf()
  • Basic C program

Q3. Compile a C Program Using GCC

Problem Statement

Compile hello.c using GCC and create an executable named hello.

C Command

gcc hello.c -o hello

Run the Program

Windows:

hello

Linux/macOS:

./hello

Expected Output

Hello, C Programming!

Concepts Covered

  • Compilation
  • GCC
  • -o option
  • Executable file
  • Running a program

Q4. Compile a C Program Without -o

Problem Statement

Compile a C program without specifying a custom executable name.

C Program

#include <stdio.h>

int main()
{
    printf("My first compiled C program.");

    return 0;
}

Save it as:

first.c

C Command

gcc first.c

Expected Result

GCC creates a default executable name.

On many Windows GCC installations:

a.exe

On Linux/macOS:

a.out

Run the Program

Windows:

a

Linux/macOS:

./a.out

Expected Output

My first compiled C program.

Concepts Covered

  • GCC compilation
  • Default executable
  • a.exe
  • a.out

Q5. Compile a Program With a Custom Executable Name

Problem Statement

Create a program that calculates the sum of two numbers and compile it with the executable name sum.

C Program

#include <stdio.h>

int main()
{
    int a = 15;
    int b = 25;

    printf("Sum = %d", a + b);

    return 0;
}

Save the file as:

sum.c

C Command

gcc sum.c -o sum

Run the Program

Windows:

sum

Linux/macOS:

./sum

Expected Output

Sum = 40

Concepts Covered

  • Custom executable name
  • -o
  • Compilation
  • Running executable
  • Arithmetic expression

Q6. Compile a Program With -Wall

Problem Statement

Compile a C program with GCC’s -Wall option to enable a broad set of useful compiler warnings.

C Program

#include <stdio.h>

int main()
{
    int number = 100;

    printf("Number = %d", number);

    return 0;
}

Save the file as:

warning.c

C Command

gcc -Wall warning.c -o warning

Run the Program

Windows:

warning

Linux/macOS:

./warning

Expected Output

Number = 100

Concepts Covered

  • Compiler warnings
  • -Wall
  • GCC options
  • Code checking

Q7. Find a Missing Semicolon Error

Problem Statement

The following C program contains a compilation error. Identify and fix the error.

Incorrect C Program

#include <stdio.h>

int main()
{
    printf("Learning C")

    return 0;
}

C Command

gcc error.c -o error

Expected Compiler Result

The compiler will report an error because the printf() statement is missing a semicolon.

The exact error message depends on the compiler version.

Correct C Program

#include <stdio.h>

int main()
{
    printf("Learning C");

    return 0;
}

Expected Output

Learning C

Concepts Covered

  • Compilation error
  • Syntax error
  • Semicolon
  • Debugging
  • Compiler error messages

Q8. Compile a C Program From a Different Folder

Problem Statement

Suppose your C program is stored inside a folder named CPrograms. Navigate to that folder using Command Prompt and compile the program.

C Program

#include <stdio.h>

int main()
{
    printf("C Programming Practice");

    return 0;
}

Save the file as:

practice.c

C Commands

Move into the folder:

cd CPrograms

Compile the program:

gcc practice.c -o practice

Run it on Windows:

practice

Expected Output

C Programming Practice

Concepts Covered

  • Folder navigation
  • cd
  • GCC compilation
  • Executable files
  • Command Prompt

Q9. Compile and Run a Program With User Input

Problem Statement

Create a C program that accepts two numbers from the user and displays their sum. Compile and run the program using GCC.

C Program

#include <stdio.h>

int main()
{
    int a, b;

    printf("Enter first number: ");
    scanf("%d", &a);

    printf("Enter second number: ");
    scanf("%d", &b);

    printf("Sum = %d", a + b);

    return 0;
}

Save the file as:

addition.c

C Command

gcc addition.c -o addition

Run the Program

Windows:

addition

Linux/macOS:

./addition

Sample Output

Enter first number: 20
Enter second number: 30
Sum = 50

Concepts Covered

  • Compilation
  • Executable
  • scanf()
  • printf()
  • User input
  • Arithmetic operation

Q10. Verify the Complete C Compiler Setup

Problem Statement

Create a small C program that uses user input, compile it, run it, and verify that your complete C programming environment is working correctly.

C Program

#include <stdio.h>

int main()
{
    int number;

    printf("Enter a number: ");
    scanf("%d", &number);

    printf("You entered: %d", number);

    return 0;
}

Save the file as:

test.c

C Command

gcc test.c -o test

Run the Program

Windows:

test

Linux/macOS:

./test

Sample Output

Enter a number: 75
You entered: 75

If the program compiles without errors and produces the expected output, your basic C compiler setup is working correctly.

Concepts Covered

  • C compiler
  • Source file
  • Compilation
  • Executable
  • User input
  • scanf()
  • printf()
  • Running a C program

Key Takeaways

  • A C compiler converts C source code into executable code.
  • GCC is a widely used compiler for C programming.
  • C source files normally use the .c extension.
  • gcc --version can be used to check GCC availability.
  • gcc file.c compiles a C source file.
  • -o allows you to specify the executable name.
  • -Wall enables many useful compiler warnings.
  • Compilation errors must be corrected before a program can run.
  • cd is used to change directories in Command Prompt or Terminal.
  • Compiling and running a small program is a good way to verify your C setup.

FAQs

1. What is a C compiler?

A C compiler is software that converts C source code into executable code that a computer can run.

2. What is GCC in C programming?

GCC stands for GNU Compiler Collection. It provides a compiler that can compile C programs.

3. How do I check whether GCC is installed?

Open Command Prompt or Terminal and run:

gcc --version

If GCC is installed and correctly configured, its version information will be displayed.

4. What does the .c extension mean?

The .c extension identifies a file containing C source code.

For example:

program.c

5. What does gcc program.c -o program do?

It compiles program.c and creates an executable with the name program.

6. What is the purpose of -Wall?

-Wall enables a broad set of commonly useful compiler warnings. These warnings can help you find potential problems in your C code.

7. Why does GCC say that gcc is not recognized?

This usually means GCC is not installed, or the compiler’s executable directory has not been added to the system’s PATH.

Written by Shubhranshu Shekhar, who has trained 20000+ students in coding.

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