42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
---
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title: Hello World C
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---
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## Hello World
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Probably the first line of text that everyone prints out on the console when one begins his/her remarkable journey of this endless programming world.
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To write on console you can use the function `printf()` contained in the library `include <stdio.h>`
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```C
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#include <stdio.h>
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int main(void)
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{
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printf("hello, world\n"); // lines starting with this (//) are called comments..
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//this code prints "Hello World!"
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printf("Hello World!\n"); //<-- the \n character prints a newline after the string
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return 0;
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}
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```
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## Explanation
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* The #include <stdio.h> is a preprocessor command. This command tells compiler to include the contents of stdio.h (standard input and output) file in the program.
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* The stdio.h file contains functions such as scanf() and print() to take input and display output respectively.
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* If you use printf() function without writing #include <stdio.h>, the compiler will generate an error during compilation of the program.
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* The execution of a C program starts from the main() function.
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* The printf() is a library function to send formatted output to the screen. In this program, the printf() function displays "Hello, World!" text on the screen.
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* The return 0; statement is the "Exit status" of the program. In simple terms, program ends with this statement.
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## Output:
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```
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>Hello, World!
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```
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#### More Information
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* Conventionally, the first ever program you write is the "hello world" program, be it in any language.
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* This is because Brian Kernighan was the first to write "hello, world" program for the documentation of the BCPL programming language developed by Martin Richards.
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