Difference between revisions of "Scope"
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| − | '''Scope''' is the range in a [[program]] over which a particular [[variable]] is visible/usable. | + | '''Scope''' is a term which has a number of meanings in the world of information systemw. |
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| + | ==Programming languages== | ||
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| + | Most formally, in a [[programming language]], it is the range in a [[program]] over which a particular [[variable]] is visible/usable. | ||
For instance, [[local variable]]s in an inner [[control flow|block]] can only be used in that block. | For instance, [[local variable]]s in an inner [[control flow|block]] can only be used in that block. | ||
| − | A '''global''' variable is one which can be seen, and used, anywhere; in | + | A '''global''' variable is one which can be seen, and used, anywhere; in programming languages which allow separately [[compiler|compiled]] [[Architecture#Architectural techniques|modules]] to be joined together with a [[linker]] after the compilation, a global variable created in one could be seen/used in any part of the linked program. |
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| + | ==Networks== | ||
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| + | In a [[communication network]], a scope means a subset of the network, one inside a boundary which selects a portion of the entire network. | ||
| − | {{stub}} | + | {{semi-stub}} |
Revision as of 14:30, 1 October 2018
Scope is a term which has a number of meanings in the world of information systemw.
Programming languages
Most formally, in a programming language, it is the range in a program over which a particular variable is visible/usable.
For instance, local variables in an inner block can only be used in that block.
A global variable is one which can be seen, and used, anywhere; in programming languages which allow separately compiled modules to be joined together with a linker after the compilation, a global variable created in one could be seen/used in any part of the linked program.
Networks
In a communication network, a scope means a subset of the network, one inside a boundary which selects a portion of the entire network.
