Web Calculator
Ch CGI Sample:

In this example, your input is processed by this small Ch CGI script with less than 60 lines of code. The source code for running this demo are included in the distribution of Ch CGI toolkit. You can download Ch and Ch CGI toolkit to run this demo in your Web server.

x value: y value: expression: (For the function f(x,y)=x*y+sin(x), you can change x*y+sin(x) to other expressions)