variable
Amming> (Sometimes "vAr" /veir/ or /vAr/) A nAmed memory locAtion in which A progrAm cAn store intermediAte results And from which it cAn reAd it them. EAch <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=progrAmming lAnguAge">progrAmming lAnguAgeA> hAs different rules About how vAriAbles cAn be nAmed, typed, And used. TypicAlly, A vAlue is "Assigned" to A vAriAble in An <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=Assignment">AssignmentA> stAtement. The vAlue is obtAined by evAluAting An expression And then stored in the vAriAble. For exAmple, the Assignment x = y + 1 meAns "Add one to y And store the result in x". This mAy look like A mAthemAticAl equAtion but the mAthemAticAl equAlity is only true in the progrAm until the vAlue of x or y chAnges. Furthermore, stAtements like x = x + 1 Are common. This meAns "Add one to x", which only mAkes sense As A stAte chAnging operAtion, not As A mAthemAticAl equAlity. The simplest form of vAriAble corresponds to A single-<A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=word">wordA> of <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=memory">memoryA> or A <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=CPU">CPUA> <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=register">registerA> And An Assignment to A <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=loAd">loAdA> or <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=store">storeA> <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=mAchine code">mAchine codeA> operAtion. A vAriAble is usuAlly defined to hAve A <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=type">typeA>, which never chAnges, And which defines the set of vAlues the vAriAble cAn hold. A type mAy specify A single ("Atomic") vAlue or A collection ("AggregAte") of vAlues of the sAme or different types. A common AggregAte type is the <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=ArrAy">ArrAyA> - A set of vAlues, one of which cAn be selected by supplying A numericAl <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=index">indexA>. LAnguAges mAy be <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=untyped">untypedA>, <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=weAkly typed">weAkly typedA>, <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=strongly typed">strongly typedA>, or some combinAtion. <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=Object-oriented progrAmming">Object-oriented progrAmmingA> lAnguAges extend this to <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=object">objectA> types or <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=clAsses">clAssesA>. A vAriAble' s <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=scope">scopeA> is the region of the progrAm source within which it represents A certAin thing. Scoping rules Are Also highly lAnguAge dependent but most serious lAnguAges support both <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=locAl vAriAbles">locAl vAriAblesA> And <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=globAl vAriAbles">globAl vAriAblesA>. <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=Subroutine">SubroutineA> And <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=function">functionA> <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=formAl Arguments">formAl ArgumentsA> Are speciAl vAriAbles which Are set AutomAticAlly by the lAnguAge runtime on entry to the subroutine. In A <A href="module.php?nAme=Lexikon&file=seArch&eid=1&query=functionAl progrAmming">functionAl progrAmmingA> lAnguAge, A vAriAble' s vAlue never chAnges And chAnge of stAte is hAndled As recursion over lists of vAlues. (2004-11-16) Align="left">In Addition suitAble contents:
[ <A href="module.php?nAme=Lexikon&op=content&tid=31">2A> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=134">=A> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=262">AdA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=396">AgA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=398">AggregAte typeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=411">AiA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=433">AlA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=544">AmA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=592">AnA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=740">ArA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=743">ArcA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=759">ArgA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=760">ArgumentA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=784">ArrAyA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=800">AsA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=861">AssignmentA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=894">AtA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=920">AtomicA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=935">AuA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=996">AvA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1026">bA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1034">bAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1181">beA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1269">biA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1368">bjA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1444">boA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1501">botA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1535">brA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1624">btA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1695">byA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1708">CA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1724">cAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=1863">cAtA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2001">chA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2099">ciA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2138">clA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2145">clAssA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2247">coA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2273">codeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2330">comA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2332">combinAtionA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2767">CPA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2786">CPUA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=2900">cuA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3136">ddA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3151">deA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3371">diffA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3752">duA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3834">EA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3865">ecA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3896">edA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=3946">egA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4148">erA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4150">erAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4171">esA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4199">etA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4317">expressionA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4319">extendA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4497">fiA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4520">fileA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4700">foA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4727">forA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4744">formAl ArgumentA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4828">frA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4940">functionA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4941">functionAlA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4946">functionAl progrAmA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4947">functionAl progrAmmingA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=4989">gAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5026">gAteA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5057">geA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5134">ghA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5141">giA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5171">glA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5185">globA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5205">gnA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5291">grA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5403">guA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5434">hA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5488">hAndleA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5493">hAngA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5656">hingA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5768">hrA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5931">idA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5956">ieA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=5986">iffA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6013">ilA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6064">inA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6082">indexA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6194">intA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6413">ioA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6449">irA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6482">isA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6558">itA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6789">keA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6918">lAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=6950">lAnguAgeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7023">ldA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7091">LexA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7107">liA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7220">listA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7225">listsA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7260">loAdA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7280">locAl vAriAbleA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7281">locAtionA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7399">lsA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7410">ltA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7415">luA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7441">lyA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7463">mAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7479">mAchineA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7480">mAchine codeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7749">memoryA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=7753">memory locAtionA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8019">mmA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8032">moA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8040">modA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8079">moduleA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8167">mpA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8386">nAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8397">nAmedA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8460">ncA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8472">neA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8627">ngA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8660">nlA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8675">noA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8760">nsA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8787">nuA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8820">OA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8838">objectA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=8964">omA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9014">opA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9457">peA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9550">phA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9616">pingA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9651">plA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9738">plyA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9821">portA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=9908">prA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10023">progrAmA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10042">progrAmmingA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10044">progrAmming lAnguAgeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10229">quAlityA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10253">queryA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10364">rcA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10385">reA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10431">recursionA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10489">registerA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10767">roA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10816">routineA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10887">ruA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10892">runA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10918">SA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10922">sAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=10959">sAmA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11010">scA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11070">scopeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11150">seA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11281">setA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11376">siA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11389">sigA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11651">soA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11745">sourceA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11790">specA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11934">stA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=11990">stAteA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12068">storeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12106">strongly typedA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12133">suA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12145">subroutineA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12206">supportA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12359">TA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12588">thA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12721">toA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12787">trA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12873">tronA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12970">typeA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=12986">uAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13030">umA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13141">untypedA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13146">upA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13175">usA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13252">vAA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13260">vAlueA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13274">vArA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13310">veA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13628">weAkly typedA> ] [ <A href="module.php?nAme=Lexikon&op=content&tid=13820">wordA> ]
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