System Variable FPC: Difference between revisions
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<td>sets the value of the Floating Point Control precision its system default state.</td> | <td>sets the value of the Floating Point Control precision to its system default state.</td> | ||
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<p>The system default value is <apll>53</apll>.</p> | <p>The system default value is <apll>53</apll>.</p> | ||
<p>For example,</p> | |||
<apll> ⎕PP←200<br /> | |||
⎕FPC←53 ⋄ *1x<br /> | |||
2.7182818284590450908<br /> | |||
⎕FPC←64 ⋄ *1x<br /> | |||
2.71828182845904523543<br /> | |||
⎕FPC←128 ⋄ *1x<br /> | |||
2.718281828459045235360287471352662497759<br /> | |||
⎕FPC←256 ⋄ *1x<br /> | |||
2.718281828459045235360287471352662497757247093699959574966967627724076630353555<br /> | |||
⎕FPC←512 ⋄ *1x<br /> | |||
2.71828182845904523536028747135266249775724709369995957496696762772407663035354759457138217852516642742746639193200305992181741359662904357290033429526059559</apll> | |||
<p>Whereas, according to Wolfram Alpha, the exact value to 230 digits is</p> | |||
<apll>2.71828182845904523536028747135266249775724709369995957496696762772407663035354759457138217852516642742746639193200305992181741359662904357290033429526059563073813232862794349076323382988075319525101901157383418793070215408914993488...</apll><br /> | |||
Revision as of 17:47, 18 August 2011
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. |
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The minimum value for ⎕FPC is 53; the maximum value is the largest positive integer 9223372036854775807.
The system default value is 53.
For example,
⎕PP←200
⎕FPC←53 ⋄ *1x
2.7182818284590450908
⎕FPC←64 ⋄ *1x
2.71828182845904523543
⎕FPC←128 ⋄ *1x
2.718281828459045235360287471352662497759
⎕FPC←256 ⋄ *1x
2.718281828459045235360287471352662497757247093699959574966967627724076630353555
⎕FPC←512 ⋄ *1x
2.71828182845904523536028747135266249775724709369995957496696762772407663035354759457138217852516642742746639193200305992181741359662904357290033429526059559
Whereas, according to Wolfram Alpha, the exact value to 230 digits is
2.71828182845904523536028747135266249775724709369995957496696762772407663035354759457138217852516642742746639193200305992181741359662904357290033429526059563073813232862794349076323382988075319525101901157383418793070215408914993488...
