Introduction

Simple program to print 'hello world' in C

File here!

#include <stdio.h>

int main(){
	printf("Hello world \n");
}

Running this program

In the command line do the following (while in the file directory):

gcc hello-world.c

./a.out

Code explanation

1. stdio.h is a standard C library to be included
2. main() is the function which is executed by C compiler each time the program in C is run. In case another function is to be called, it can be called via main.
3. printf prints the output on the screen
4. gcc hello-world.c creates output file a.out. This command converts the high level language written in C to binary for out computer to understand it
5. ./a.out is run to see the output
6. #include is the pre-processor directive which will fetch the file stdio.h for predefined functionalities of C

Note:

#define is another preprocessor used in C discussed ahead gcc -Wall -save-temps hello-world.c is used to see all the temporary files that are created while a C program in executed and converted from high level language to assembly language to machine code and finally to the output