Scaparra.com

Just got my monitor back from Samsung and now I can’t return the other one so… I have three. I am in love with this set up.

A friend of mine asked me today about this topic so in case I am asked about it in the future I am posting my response here.

Sometimes when writing an application in C++, C, Java, etc… if is nice to separate functionality of the program into different modules, i.e. files. This is absolutely necessary in larger programs. The following is an example of hello world spread out into two .cpp files and one .h.

main.cpp



#include “printFunctions.h” // this is where printMessage() is defined

int main()
{
printMessage();
return 0;
}

printFunctions.cpp



#include “printFunctions.h”

void printMessage( )
{

std::cout << “Hello World” << std::endl;

}

printFunctions.h

#ifndef PRINT_FUNCTIONS_H
#define PRINT_FUNCTIONS_H

#include<iostream>

void printMessage();

#endif

makefile

OBJS=main.o printFunctions.o
CC=g++
CXXFLAGS=-ggdb -g3 -g -O2 -Wall
DEPEND= makedepend $(CFLAGS)

helloWorld: $(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS)

clean:
-rm *.o helloWorld

And that is all there is to it. We can use the make file to compile the program in the following manner:

scap@Earth ~/example $ make
g++ -ggdb -g3 -g -O2 -Wall   -c -o main.o main.cpp
g++ -ggdb -g3 -g -O2 -Wall   -c -o printFunctions.o printFunctions.cpp
g++  -o helloWorld main.o printFunctions.o
scap@Earth ~/example $ ./helloWorld
Hello World
scap@Earth ~/example $ make clean
rm *.o helloWorld
scap@Earth ~/example $

Here are the Example Files. Just run tar xzvf exampletar.gz to unpack.

Jeff

So tomorrow (or by the time I finish this post later today) I leave for DC but before hand I needed to get a server setup so that I could work on my research from afar during the summer. The Sun X2100 seem to have problems with the newest version of Ubuntu Server 8.04. They are generating NCQ errors in the SATA controllers. NCQ is part of the SATA II standard and is supposed to increase efficiency however none of our machines hardware liked using it. Thought I would show off the geek fest with a photo of our three servers hooked up to my 50 inch TV with my desktop and mac in the background.