C++ Question

[scottlc]

I am using Dev-C++ and wondering why

(I removed the pointed brackets from the header names because the browser mistakes it for HTML)

#include stdio.h

int main()
{
  printf("hello world");
  return 0;
}

Compiles to a 22.6K exe whereas

#include iostream.h

int main()
{
    cout <<"hello world";
    return 0;
}

Compiles to a 420K exe.

[Recca]

Is code 1 (C)
whereas code 2 is (C++).

Im just curios. Since im pretty sure Code 2 is C++.
But i haven't seen code 1 before, but the structure is the same, so i just though it might be C

[scottlc]

Yes, but why should the second one be 420K in size? Why does using iostream.h increase the filesize by ~400K?

[kairi00]

The C++ iostream library encapsulates the stream manipulations into 2 basic classes (cin and cout). It abstracts a LOT of the nitty-gritty details (especially in file manipulations) that otherwise you have to deal with when using the C stdio library. With all these abstractions and encapsulation, your life is easier when doing I/O, however, as a tradeoff the compiled filesize is bigger.

[scottlc]

But that same program compiled with MetroWerks Codewarrier 6 is only 72K

[kairi00]

Now that goes beyond my knowledge. It's different compiler behaviours. Different compilers treat and compile different code differently. There may be some optimization flags you can set here and there to tweak the code size. Check the documentation of the compiler(s) you're using to see what types of optimization flags you can use to reduce binary size or do a processor specific optimization, etc.

[scottlc]

Dev-C++ uses Mingw. By adding -s argument to the linker and running the EXE through UPX, I was able to get the filesize down to 72K.

[Recca]

Where did you get that proggy Scott. Is it freeware or shareware.??

[scottlc]

It's open source. That's what the ePSXe team use to compress their EXEs.

http://upx.sourceforge.net/