Control variable (programming): Difference between revisions
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#REDIRECT [[Control flow]] |
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{{short description|Regulates the flow of control of a program}} |
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{{confuse|text=[[Control variable|Control variables]] in science or [[Controlling for a variable]] in statistics}} |
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In [[computer programming]], a '''control variable''' is a [[program variable]] that is used to regulate the [[flow of control]] of the program. |
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In definite iteration, control variables are variables which are successively assigned (or bound to) values from a predetermined sequence.<ref name="Watt">{{cite book |last1=Watt |first1=David A. |title=Programming Language Design Concepts |url=https://archive.org/details/programminglangu00watt_497 |url-access=limited |date=2004 |publisher=Wiley |pages=[https://archive.org/details/programminglangu00watt_497/page/n102 84]-85}}</ref> |
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== Special rules == |
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In some programming languages, control variables are just ordinary variables used for manipulating the program flow. This is the case of [[C (programming language)|C]], [[Fortran]], and [[Pascal (programming language)|Pascal]], which allow for control variables to have their values changed within the loop body.<ref name="Watt"/> However, some languages have special rules for control variables. In [[Ada (programming language)|Ada]], for instance, the control variable of a [[For loop|for-loop]] must remain constant within the loop body. |
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== References == |
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{{reflist}} |
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{{Computer science}} |
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[[Category:Mathematical terminology]] |
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[[Category:Computing terminology]] |
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{{comp-sci-stub}} |
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Revision as of 03:19, 24 February 2023
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