• Open a terminal
• Create your file by writing the following command

vim ex1.c

• Enter insertion mode by pressing Insert
• Write the lines below

#include <stdio.h>
 
int main(){
 
	printf("Hello world !\n");
 
	return 0 ;
}

• Then press Esc key
• Write :wq
• Compile your code with the following line

gcc -Wall ex1.c -o ex1

• Then run your programm by typing “./ex1” in the terminal