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Write a program to print hello world

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Answer with Explanation

C Programming Language

C Program to Print "Hello World"

The "Hello World" program is traditionally the first program that beginners write when learning a new programming language. It demonstrates the basic structure of a C program and how to display output on the screen using the printf() function.

Program Objective: Write a C program to display the message "Hello World" on the console.

Algorithm

  1. Start the program.
  2. Include the header file.
  3. Create the main() function.
  4. Use the printf() function to display Hello World.
  5. Return 0 to indicate successful execution.
  6. End the program.

C Program


#include 

int main()
{
    printf("Hello World");

    return 0;
}

Output


Hello World

Program Explanation

Statement Explanation
#include Includes the Standard Input/Output header file, which provides the printf() function.
int main() The main() function is the entry point where program execution begins.
printf("Hello World"); Displays the text Hello World on the screen.
return 0; Ends the program and returns a success status to the operating system.

Program Flow


Start
   │
   ▼
Include stdio.h
   │
   ▼
main()
   │
   ▼
printf("Hello World")
   │
   ▼
return 0
   │
   ▼
End

Key Points

Important Notes

  • printf() is used to display output on the screen.
  • must be included to use printf().
  • Every standard C program begins execution from the main() function.
  • return 0; indicates that the program executed successfully.

Common Mistakes

Avoid These Mistakes

  • Forgetting to include .
  • Misspelling printf().
  • Missing the semicolon (;) after the printf() statement.
  • Using void main() instead of int main() in standard C.
  • Forgetting the double quotation marks around the string.

Best Practices

  • Always write int main() for standard C programs.
  • Indent the code properly for better readability.
  • Use meaningful comments when necessary.
  • Return 0 after successful execution.

Prerequisites

Before Learning This Program

  • Basic understanding of C program structure.
  • Knowledge of the main() function.
  • Basic understanding of the printf() function.
  • Familiarity with the header file.

Interview Questions

  1. Why is included in this program?
  2. What is the purpose of the printf() function?
  3. Why does the main() function return 0?
  4. Can this program run without the main() function?
  5. What happens if the semicolon after printf() is omitted?

Key Takeaway

The Hello World program is the simplest C program and is often the first step in learning C programming. It introduces the basic program structure, the main() function, the header file, and the printf() function used to display output on the screen.

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