Help newbie,please!

[dgcoder]

Hi,My name is Nan,I am C/C++ programmer and now I am going to learn java,but I have a litlle problem.Can you help me find out functions in java or is there another "things" that can compare functions.
Like I want a make calculator,which will have function calc() to calculate expressions.

[evlich]

Java is very closesly related to C++, it was designed that way. Functions work pretty much the same way that they do in C++, but the thing is that everything has to be in a class. So to start you calculator example you might start with something like:

public class Calculator {
  public int clac(String expr) {
    // ... Code for evaluating goes here
  }
  public static void main(String[] argv) {
    System.out.println(new Calculator().calc(argv[0]));
  }
}

If you want to learn Java, I would look at some of the tutorials online. Sun has some decent ones: http://java.sun.com/docs/books/tutorial/.

I hope this helps.

[karthikeyan]

If you want to make use of the Java built in functions. Then try the class

"java.lang.Math" , in which a set of mathematical functions are there.

Cheers