Basic example: Creating and running “Hello World”

Create the following C program and name the source file hello.c:

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

Compile the program:
- If Blue Gene/L™ short invocation commands have been set up, enter the following command:
```
 blrts_xlc hello.c -o hello
```
  If short invocation commands have not been set up, enter the following command:
```
 /opt/ibmcmp/vacpp/bg/9.0/bin/blrts_xlc hello.c -o hello
```
- If Blue Gene/P™ short invocation commands have been set up, enter the following command:
```
 bgxlc hello.c -o hello
```
  If short invocation commands have not been set up, enter the following command:
```
 /opt/ibmcmp/vacpp/bg/9.0/bin/bgxlc hello.c -o hello
```
Run the program by entering the following command:
```
  ./hello
```
The result should be "Hello World!".
Check the exit code of the program by entering the following command:
```
  echo $?
```
The result should be 0.

Create the following C++ program and name the source file hello.cpp:

#include <iostream>
int main()
{
   std::cout << "Hello World!" << std::endl;
   return 0;
}