Equation Handling

Weirdo80 SG

Doing an large enterprise calculation system that requires complex math functions to be stored in the database and used in future simulation scenarios.

I thoroughly understand the process of using Reverse Polish Notation to convert the user-entered equations into a computer-readable form. However, I have problems with tokenizing the equation string. If anyone can point me in the right direction....that'll be awesome

For example, if the user enters:

z = sin(x) / 40 * cos(-50) + log(2.953 + pi)

I have to tokenize the input string into operators and operands. Having problems with this. The language is C#.

ndmmxiaomayi SG

I haven't learn C# yet...

Sorry, cannot help.

But learn from ASP.NET that when you start, you need to end.

Your code like got start no end. Like this part below:

foreach (char c in strInput.ToCharArray() )
{
if (c=='x')
tokens.Add("x") ;
else if (c=='y')
tokens.Add("y") ;
else if (Char.IsDigit(c) || c=='.')
numberStack.Push(c) ;
else if (Char.IsLetter(c) )
letterStack.Push(c) ;

}

Or does the sign } means ending?

In ASP.NET will be If ... End If

Weirdo80 SG

If..End If is for VB.NET only. I’m using C# in which codeblocks are demarkated by { }

ndmmxiaomayi SG

I see.

Then cannot help liao. Have learnt only VB.NET and ASP.NET