السلام عليكم
Calc98 is a pocket calculator simulator program for the Microsoft Windows operating systems. It can be used in place of the calculator program which is included with the operating system, with many additional features and greater flexibility. On handheld devices, it can be used in place of a pocket calculator. It is especially designed for scientific and engineering students and professionals and includes a wide range of units conversions and scientific functions. It also has statistics, financial and time functions, including a stopwatch.
التحميل من الموقع
http://www.calculator.org/DownloadFile.aspx?filename=c9853w.exe
شرح البرنامج
http://www.calculator.org/CalcHelp/index.htm
بالتوفيق..