C Example – Hello World

Here below are many C Example Hello World codes that are available related to Hello World if you have any doubts please post in the comment section. The “Hello World” example in the C programming language is often the first program beginners encounter when learning to code. It’s a simple program that prints “Hello, World!” to the screen. This program serves as a basic introduction to programming syntax and structure in C.

Example: Hello World

This “Hello world” C Example is one of the good in anything startup. Here we are going to print the "ArunEworld" string in the console.

For the below code, you should know the following

• C programing structure.
• Headfile declarations
• Function declaration.
• stdio.h library function printf() functions and use.
• # preprocessor command.

Code

The below code ran on GCC version 4.6.3.

#include <stdio.h>
int main()
{
	printf("ArunEworld");
	return 0;
}

Output : ArunEworld

Explanation

Code	Explanation
#include	The #include the directive said the preprocessor to insert the contents of another library or user-defined files into the source code.
<>	This symbol denotes Pre-defined library functions. So that the compiler will include the respective header file from the library files location from the installed directory.
stdio.h	The stdio.h file contains many library functions like print(), scanf() , etc.
int	Declared the main function return type as an integer.
main()	Denotes the actual program should run from here.
{}	Open and close curly braces need to be defined in each function starting and ends
printf()	The above code, printf() is used to take input and display output in the console. if you did not include stdio. h in the library then the compiler will produce the error during compile time.
"ArunEworld"	The string ArunEworld is going to print the console.
;	The semicolon is used to terminate the function execution action.
return	The return keyword is used to return any specified output that wants to return in a function.

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Example: Without the preprocessor command, try to add the header file.

Code

include <stdio.h>
int main()
{
	printf("ArunEworld");
	return 0;
}

Output (failed): Compilation failed due to the following error(s).

main.c:1:9: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘<’ token include
^

Code Explanation

It seems like you forgot to add a # symbol before include in the #include <stdio.h> line. The correct syntax for including a header file in C is to use the #include preprocessor directive. Here’s the corrected code:

#include <stdio.h>

int main() {
    printf("ArunEworld");
    return 0;
}

Now, the code should compile without any issues.

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Example: Hello World Depth Understanding-1

int main()
{
	return 0;
}

//error : Error May not Come

Code Explanation

The provided code doesn’t contain any syntax errors, so it should compile without any issues. However, it’s worth noting that this program doesn’t perform any meaningful operations; it simply returns 0 from the main function. Depending on the context or requirements, this might be perfectly fine, but typically, you would have some code within the main function to execute a program’s logic.

If you’re encountering an error despite the code being correct, there might be an issue with your compiler or development environment setup. Make sure your compiler is properly configured and that there are no external factors causing the error. If you continue to encounter problems, providing more context or information about the error message would be helpful in diagnosing the issue.

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Example: Hello World Depth Understanding-2

int main()
{
	printf("arun");
}

// error may come : In function 'int main()': 	[Error] 'printf' was not declared in this scope

Code Explanation

The error message suggests that the printf function is not recognized within the scope of the main function. This typically occurs when the necessary header file, <stdio.h>, which declares the printf function, is not included at the beginning of the program. To resolve this issue, ensure you include the <stdio.h> header file at the top of your program. Here’s the corrected code:

#include <stdio.h>

int main() {
    printf("arun");
    return 0;
}

By including <stdio.h>, you ensure that the compiler knows about the printf function and can properly compile your code.

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https://aruneworld.com/programming-language/c/c-examples/