System Function LC: Difference between revisions

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<h1><apl>{quad}LC</apl> - Line Counter</h1>
<h1><aplxx>⎕LC</aplxx> - Line Counter</h1>
 
<apll>⎕LC</apll> is an [https://www.iso.org/standard/22817.html ISO/IEC 13751] standard niladic system function which returns an integer vector of the current line numbers being executed in every current function. Consider the following functions:
 
<apll><pre>
    ∇ test
[1]  'LC=',⎕LC
    ∇
 
    ∇ test2
[1]  'Calling test'
[2]  test
    ∇
</pre></apll>


<apll>{quad}LC</apll> is an [[ISO 13751]] standard niladic system function which returns an array of the current line numbers being executed in every current function. Consider the following workspace:
<apll>{del} test<br/>[1] 'LC=' {quad}LC<br/>{del}<br/><br/>{del} test2<br/>[1] 'Calling Test'<br/>[2] test<br/>{del}<br/></apll>
So the following commands would produce the following output:
So the following commands would produce the following output:
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;test<br/>LC= 1 <br/><br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;test2<br/>Calling Test<br/>LC= 1 2</apll>


In the first example where the function '''test''' is invoked, only function test is executing so only a scalar - the current line number of test that is being executed - is shown. In the second example where the function '''test2''' is invoked, the APL interpreter program is currently executing line 1 of function '''test''', which was called by line 2 of '''test2''', thus an array of values 1 and 2 is returned.
<apll><pre>
      test
LC= 1
      test2
Calling Test
LC= 1 2
</pre></apll>
 
In the first example where the function '''test''' is invoked, only function '''test''' is executing so a one-element vector - the current line number of '''test''' that is being executed - is shown. In the second example where the function '''test2''' is invoked, the APL interpreter program is currently executing line 1 of function '''test''', which was called by line 2 of '''test2''', thus a two-element vector of values 1 and 2 is displayed.


<apll>{quad}LC</apll> is a ''niladic'' function, you cannot assign a value to it.
{{SFN|LC}}
{{System Variables}}

Latest revision as of 11:10, 16 April 2018

⎕LC - Line Counter

⎕LC is an ISO/IEC 13751 standard niladic system function which returns an integer vector of the current line numbers being executed in every current function. Consider the following functions: 

    ∇ test
[1]   'LC=',⎕LC
    ∇

    ∇ test2
[1]   'Calling test'
[2]   test
    ∇

So the following commands would produce the following output: 

      test
LC= 1
      test2
Calling Test
LC= 1 2

In the first example where the function test is invoked, only function test is executing so a one-element vector - the current line number of test that is being executed - is shown. In the second example where the function test2 is invoked, the APL interpreter program is currently executing line 1 of function test, which was called by line 2 of test2, thus a two-element vector of values 1 and 2 is displayed.


Note: ⎕LC is a niladic form system function, you cannot assign a value to it.

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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