Thread: 2 questions...

I can answer one of your two questions:


the cheap and easy way

Code:

#include<cmath>

int answer = pow(number, exponent);

recursively

Code:

double power( double base, int exp)  
{
      if (base == 0)  //base is zero, and exp should be positive

           return 0;

      else if (exp == 0)

           return 1;

      else if (n > 0)  
       
           return base * power(base, exp - 1);

      else   //base is nonzero, and exp is negative

           return  1/power(base, -exp);

}

1: you can use the pow function.

2: A c++ compiler can pretty much compile all c source there are some random things that c++ will complain about c. I don't know them but I am sure someone here does

>>I have source code for a prgram but it is written in C i want to compile the code in C++
If it's written in C, it's written in C. If you want to understand it, compiling it for C++ isn't going to do one bit of difference, because you still won't understand the code.

If the unreadability of the code is due to lack of headers etc, then it's poorly written code, and the unreadability has nothing to do with the language.

>>but alot is eluding me
Whatever you don't get, try and figure out; when you get stuck, ask for help.

Originally Posted by The Brain

recursively

Code:

double power( double base, int exp)  
{
      if (base == 0)  //base is zero, and exp should be positive

           return 0;

      else if (exp == 0)

           return 1;

      else if (n > 0)  
       
           return base * power(base, exp - 1);

      else   //base is nonzero, and exp is negative

           return  1/power(base, -exp);

}

What is n?

oops..

Code:

n == exp

double pow( double base, double exp ); // Valid C and Valid C++

pow() uses type double. So, you can raise a number to a non-integer. i.e. 2 to the 2.5 power. (You can't do that with the loop or recursion method.) This also means that you might have to typecast if you're not working with doubles.

Always use the fully-debugged built-in standard functions, unless you have a really good reason not to!

If your source is written in standard C, It should compile fine on a C++ compiler. 99% of C is valid C++ too. That is, C is mostly a subset of C++.

However, if your source contains non-standard code, it won't compile. Compare all of the header files used in the code to a list of standard C++ headers. (I use dinkumware.com as a standard reference.) If all of the headers are standard, you should be OK. If your source includes something non-standard like graphics.h, you'd need the original compiler for-which the program was written.

You didnt help at all!

Assuming this was from Junior, was a negative rep, and wasn't sarcastic:

If you clarified your question, you might have gotten a more helpful answer.

>>I have source code for a prgram but it is written in C i want to compile the code in C++
Very well, somebody already told you that C can be generally compiled as C++. I simply added that compiling will do nothing toward 'converting' the source code to C++

>>What are the major differences and how do i convert them?
To this, my very valid reply was that if there are incompatibilities then it is nigh impossible to 'translate' the C code into C++ without knowing anything about what it is, what the errors are, etc. And if it compiles fine but you simply do not understand what it does, then that indicates that you do not know enough C++ to understand it - because apparently it is valid C++ as well.

>>I tried finding some source in C++ but i couldn't.
Very good.

>>Like there are no header files and stuff like that.
As I tried to explain, headers are in C too. That code is very likely valid C++ as well, so a lack of headers has nothing to do with the language. It's simply that whoever wrote the code did a bad job and made it really messy and unreadable.

>>I can figure out most of the C code but alot is eluding me.
And to this I replied, figure out what you can and we'll help with the rest. Was that not fair of me? You have not shown one byte of code, and yet you expect us to somehow magically come up with an answer for your unanswerable nonsensical question. Show some code and we'll help you understand it.

>>But i really want to understand the code
Good for you.

>>how do i convert them?
Convert what?

>>I didnt say i wanted your help with specifics at all.
I apologize. I was under the distinct impression otherwise.

>>The program is way over Your head anyway mathematics wise.
Very likely so, but then it would seem likely that your own chances of understanding it are very slim as well. And you don't need to capitalize 'Your' when referring to me. I'm not God.

You really look like a big game hunter with your little Chipmunk Avatar, i use them for target practice with my BB Gun. Your a big man now go out and get a real gun and do some real hunting you Wannabe Hunter!

I'm a computer nerd who happened to pick the name Hunter2 a long time ago, and who happened to take a picture of a ground squirrel in a no-hunting national park and use it as my avatar, while in highschool.

May the gurus red-square you to oblivion; I came with the intention to help, and I now wash my hands clean of this whole bloody affair.

This is done