System Variable FPC
Floating Point Control
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| Z is an integer scalar that represents the current value of the number of bits of precision used for VFP numbers. |
| ⎕FPC←R | sets the value of the Floating Point Control precision to R. |
| ⎕FPC←⍬ | sets the value of the Floating Point Control precision to its system default state. |
The minimum value for ⎕FPC is 53; the maximum value is the largest positive 32-bit integer 2147483647.
The system default value is 128.
For example, (note: these numbers are normally one long string of digits; they are broken here, with the break shown by {continued) for your convenience in reading)
⎕PP←200
⎕FPC←64 ⋄ *1x
2.71828182845904523543
⎕FPC←128 ⋄ *1x
2.718281828459045235360287471352662497759
⎕FPC←256 ⋄ *1x
2.71828182845904523536028747135266249775724709369995957 (Continued)
4966967627724076630353555
⎕FPC←512 ⋄ *1x
2.71828182845904523536028747135266249775724709369995957 (Continued)
49669676277240766303535475945713821785251664274274663919 (Continued)
3200305992181741359662904357290033429526059559
Whereas, according to Wolfram Alpha, the exact value to 230 digits is
2.71828182845904523536028747135266249775724709369995957496 (Continued)
6967627724076630353547594571382178525166427427466391932003059921 (Continued)
8174135966290435729003342952605956307381323286279434907632338298 (Continued)
8075319525101901157383418793070215408914993488...
| System Variables (A value may be assigned to these except for ⎕DM) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| ⎕ALX | ⎕CT | ⎕DM | ⎕DT | ⎕ELX | ⎕FC | ⎕FEATURE | ⎕FPC | ⎕IC | ⎕IO |
| ⎕LR | ⎕LX | ⎕PP | ⎕PR | ⎕PW | ⎕RL | ⎕SA | ⎕WSID | ||
| Niladic System Functions (a value cannot be assigned to these) | |||||||||
| ⎕A | ⎕AV | ⎕EM | ⎕ET | ⎕LC | ⎕NNAMES | ⎕NNUMS | ⎕SI | ⎕SYSID | ⎕SYSVER |
| ⎕T | ⎕TC | ⎕TCBEL | ⎕TCBS | ⎕TCESC | ⎕TCFF | ⎕TCHT | ⎕TCLF | ⎕TCNL | ⎕TCNUL |
| ⎕TS | ⎕WA | ||||||||
| Monadic or dyadic system functions (a value cannot be assigned to these) | |||||||||
| ⎕AT | ⎕CR | ⎕DC | ⎕DFT | ⎕DL | ⎕DR | ⎕EA | ⎕EC | ⎕ERROR | ⎕ES |
| ⎕EX | ⎕FMT | ⎕FX | ⎕MF | ⎕NAPPEND | ⎕NC | ⎕NCREATE | ⎕NERASE | ⎕NINFO | ⎕NL |
| ⎕NLOCK | ⎕NREAD | ⎕NRENAME | ⎕NREPLACE | ⎕NRESIZE | ⎕NSIZE | ⎕NTIE | ⎕NUNTIE | ⎕STOP | ⎕TF |
| ⎕TRACE | ⎕UCS | ⎕VR | |||||||
| Note that quad functions and variables (except for the ⎕A family of functions) are case insensitive | |||||||||
