Slia：创建页面，内容为“The Declaration of A VariableVariables declaration in a Macro can be GLOBAL or LOCAL. == Global Declaration == The `GLOBAL` modifier in the […”

2018-06-07T08:07:11Z

创建页面，内容为“The Declaration of A Variable Variables declaration in a Macro can be GLOBAL or LOCAL. == Global Declaration == The <code>GLOBAL</code> modifier in the […”

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The Declaration of A [[Variable]][[Variables declaration]] in a [[Macro]] can be GLOBAL or LOCAL.

== Global Declaration ==
The <code>GLOBAL</code> modifier in the [[variable]] declaration makes the [[variable]] created in the [[macro]] '''accessible''' to the main Program. 
This is used when the result of a [[macro]] shall be used in the main program. 
The Following example will show that the result of the [[macro]] will be in the DB Viewer even if the [[variable]] has not been declared explicitly in ARCO.
 

<code>$$ Example of a MACRO with GLOBAL Result </code>
<code>M(SUM_TWO_NUMBERS)=MACRO/NUMBER1,NUMBER2</code>
::<code>DECL/GLOBAL,DOUBLE, RESULT</code>
::<code>RESULT=ASSIGN/NUMBER1+NUMBER2</code>
<code>ENDMAC</code>

<code>CALL/M(SUM_TWO_NUMBERS),100,200</code>

== Local Declaration ==
The <code>LOCAL</code> modifier in the [[variable]] declaration makes the [[variable]] created in the [[macro]] '''NOT accessible''' to the main Program.
This is useful when a support [[variable]] shall be used in the [[macro]] but it is not interesting for the main program. 
The Following example will show that the result of the [[macro]] will be in the DB Viewer '''but not the temporary [[variable]]'''.
 

<code>$$ Example of a MACRO with GLOBAL Result and Temporary Variable Locally declared </code>
<code>M(AVERAGE_3_NUMBER)=MACRO/NUMBER1,NUMBER2,NUMBER3</code>
::<code>DECL/LOCAL,DOUBLE, SUM</code>
::<code>DECL/GLOBAL,DOUBLE, RESULT</code>
::<code>SUM=ASSIGN/NUMBER1+NUMBER2+NUMBER3</code>
::<code>RESULT=ASSIGN/SUM/3</code>
<code>ENDMAC</code>

<code>CALL/M(SUM_TWO_NUMBERS),100,200</code>

[[it:Variabile globale e locale nella macro]]
[[zh-cn:宏中的全局和局部变量]]
[[pt:Variável global e local na macro]]
[[de:Globale und lokale Variable im Makro]]
[[es:Variable global y local en macro]]
[[en:Global And Local Variable In Macro]]

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Slia：创建页面，内容为“The Declaration of A VariableVariables declaration in a Macro can be GLOBAL or LOCAL. == Global Declaration == The GLOBAL modifier in the […”

Slia：创建页面，内容为“The Declaration of A VariableVariables declaration in a Macro can be GLOBAL or LOCAL. == Global Declaration == The `GLOBAL` modifier in the […”