C++ help

[DarkRanger]

Hi guys,

I'm looking for the best possible way to learn C++. I have experience in Java programming, so I would like something that looks at C++ with Java as a background.

I know of a book called C++ for Java programmers, but I am also interested in online resources. If you know of any, PLEASE give me a shout!!

Thanks!

[RuadRauFlessa]

Best thing would be to forget everything you have learned in Java. Take it from someone that needed to do the migration himself. If you don't you will shoot yourself in the foot with assumptions. Rather learn the language from scratch. From Java the only one you can take up with relative ease in terms of how it works and what there is to work with is C#.

[DarkRanger]

Forgetting Java will make me fail next semester!

But I get what you are saying. Any good articles you can point me to for the beginner? I tried googling, but you get so many claims of code that will turn you into a genius, and I don't know which to trust.

[RuadRauFlessa]

Check this out. It should help you for a whiles

Or this is also very good place for resources

[rustypup]

Best thing would be to forget everything you have learned in Java.

i disagree... java coding habits are an excellent base to work from ...

single inheritance
OOAD
event handling
MVC

c++ will add to DarkRanger's toolkit by introducing:
the preprocessor
memory management and a deeper understanding of leaks and garbage collection..
the power of pointers
a better understanding of reference, value and scope...
real structs...
the joy of operator overloading
multiple inheritance, (and why it's not as good as it sounds)

amongst others...


@DarkRanger: your class design undergoes a paradigm shift because each class is split into 2 files, which means your class template and its implementation don't reside side-by-side as they do in java.

each object you design will need an implicit constructor and destructor, (the java compiler would typically create these for you if omitted)

aside from that, it is worth the effort to go back to basics for now... C++ Tutorial is as good as any starting point... pay attention to pointers, namespaces and scope... these are the high bug producing areas of the language...

[RuadRauFlessa]

I did not mean forget how to code. Just the language. How to code you will always need and the more langs you know the easier it will be to go to the next one.

[rustypup]

I did not mean forget how to code. Just the language.

ahh... got you... will apply more coffee posthaste...

[DarkRanger]

Thanks for the help guys.

I'll ask again if something comes up.

[RuadRauFlessa]

Thanks for the help guys.

I'll ask again if something comes up.

NP. Just shout around here somewhere and someone is bound to hear it

[DarkRanger]

Okay, I must be doing something stupid, as I googled the error and I couldn't find an error similar to mine.

Here is my source code:

Code: Select all

#include <iostream>
using namespace std;

int main(int argc, char** argv)
{
	if(argc < 4)
		cout<<"ERROR - Too few arguments passed. Correct usage is ./cos121_prac1 x y z where x y z are positive integers."<<endl;
	else if(argc > 4)
		cout<<"ERROR - Too many arguments passed. Correct usage is ./cos121_prac1 x y z where x y z are positive integers."<<endl;
	else
		cout<<"ENOUGH ARGUMENTS PASSED"<<endl;
}

This is my makefile code:

Code: Select all

cos121_prac1 : main.o
	g++ -static -main.o -o cos121_prac1

main.o : main.cpp
	g++ -static -c main.cpp -o main.o

clean:
	rm main.o cos121_prac1

And here is the error I am getting when I enter make cos121_prac1

Code: Select all

g++ -static -c main.cpp -o main.o
g++ -static -main.o -o cos121_prac1
g++: no input files
make: *** [cos121_prac1] Error 1

Any suggestions to what I might be doing wrong?

[DarkRanger]

any help?

[rustypup]

g++: no input files

the compiler is telling you exactly what the issue is... given that it didn't belch during compilation, we have only to glance at:

g++ -static -main.o -o cos121_prac1

to find the suspect...

[DarkRanger]

g++: no input files

the compiler is telling you exactly what the issue is... given that it didn't belch during compilation, we have only to glance at:

g++ -static -main.o -o cos121_prac1

to find the suspect...

bows head in shame. Thanks rusty. It works now...