Introduction to UNIX programming

THE BASIC steps required to create a C or C++ Linux program.

* How to create a C and C++ programs on Linux environment
* Compiling code
* Debugging the result

Program 1. C source file—main.c

#include <stdio.h>

int main(void)
{
printf("\nHello, World\n\n");
return 0;
}

The main function serves a special purpose in C programs:

* The run-time environment calls the main function to begin
program execution.

* The opening curly brace indicates the beginning of the
definition of the main function.

* A function named printf, which was declared in
stdio.h and is supplied from a system library

* The return statement terminates the execution of the main
function and causes it to return the integer value 0, which is
interpreted by the run-time system as an exit code indicating
successful execution.

* The closing curly brace indicates the end of the code for
the main function.

Compiling a single C source file:

The C++ compiler is called g++.

> g++ main.c -o main.c.o

Output: