Thanks Richard and Werner. Yes, the double precision floating point number is enough to ues in a general way in engineering calculation. Sometimes I just only want to expand the application range of my program, for example to any number.
Werner Exinger 编写:
If you really need that precision you may have to chose specialized programs suitable for number theory or you will have to program your arithmetic yourself using Mathcads strings and matrices facilities. This sure would be quite some work.
I haven't learned number theory in college, and I never thought it would be so much great useful in programming! I have ever seen an example program to get arbitrary precision of PI by matrix programming in Mathcad, and the arithmatic of it is a bit difficult to understand.
Thank you again 