System Variable FPC

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⎕FPC - Floating Point Control

Z←⎕FPC returns the current value of the Floating Point Control precision.
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←240
      ⎕FPC←64  ⋄ *1x
2.71828182845904523543
      ⎕FPC←128 ⋄ *1x
2.718281828459045235360287471352662497759
      ⎕FPC←256 ⋄ *1x
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)
7724076630353555
      ⎕FPC←512 ⋄ *1x
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)
7724076630353547594571382178525166427427466391932003059921817413 (Continued)
59662904357290033429526059559
      ⎕FPC←1024 ⋄ *1x
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)
7724076630353547594571382178525166427427466391932003059921817413 (Continued)
5966290435729003342952605956307381323286279434907632338298807531 (Continued)
9525101901157383418793070215408914993488416750924

Whereas, according to Wolfram Alpha, the exact value to 230 digits is

2.71828182845904523536028747135266249775724709369995957496696762 (Continued)
7724076630353547594571382178525166427427466391932003059921817413 (Continued)
5966290435729003342952605956307381323286279434907632338298807531 (Continued)
9525101901157383418793070215408914993488...


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


See Also
System Commands System Variables and Functions Operators


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