RPN-PRGM: New Windows console application emulating HP calculators

[Aacini]

Albert Chan,

Well, the fact that changing the Precision Control alters the results of the same operations is not a bug, but a well-known fact. As a matter of fact, is the basis of the example about the Forensics Algorithm:

RPN.exe users manual Wrote:This is an example of such an operation based on the Forensics Algorithm:

Code:

RPN FPUPC:0 9 Deg Sin Cos Tan ATan ACos ASin FIX:16

. The exact result of this expression is 9, but the real results are 9.0338335037231445, 9.0000000001046097 and 8.9999999999999130 when the precision is set to 0, 2 and 3, respectively.

Another example:

Code:


RPN: FPUPC:3 1e16 sci:16 out out:" = " eng:17 out out:" = " hex:3 out
1.0000000000000000E+016 = 10.0000000000000000E+0015 = 4034_8E1B_C9BF_03FF_FFF9

RPN: FPUPC:2 1e16 sci:16 out out:" = " eng:17 out out:" = " hex:3 out
1.0000000000000000E+016 = 99.9999999999999744E+0015 = 4034_8E1B_C9BF_03FF_FFF9

RPN: FPUPC:0 1e16 sci:16 out out:" = " eng:17 out out:" = " hex:3 out
9.9999999999999820E+015 = 9.22337203685477580E+0015 = 4034_8E1B_C9BF_03FF_B800

RPN: FPUPC:3 1e16 sci:16 out out:" = " eng:17 out out:" = " hex:3 out
9.9999916826296320E+015 = 9.22337203685477580E+0015 = 4034_8E1B_C200_0000_0000

Antonio