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...


See Also: Comparison Tolerance ⎕CT


System Variables (A value may be assigned to these except for ⎕DM)
ALX CT DM DT ELX FC FEATURE FPC IC IO
LX PP PR PW RL SA WSID
Niladic System Functions (a value cannot be assigned to these)
A AV EM ET LC NNAMES NNUMS 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 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 are case insensitive


See Also
System Commands System Variables and Functions Operators
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