Utilizzo di istruzioni condizionali

Operatori > Operatori di programmazione > Utilizzo di istruzioni condizionali

Gli operatori condizionali possono essere utilizzati per definire funzioni.

Valutare l'istruzione condizionale come descritto di seguito.

elseif	alsoif
<region id="ID0ECACS" top="38.400000000000006" left="57.600000000000009" height="282.00000000000006" width="172.01333333333335" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="23"> <define xmlns="http://schemas.mathsoft.com/math50"> <function> <id labels="VARIABLE" xml:space="preserve">f</id> <boundVars> <id labels="VARIABLE" xml:space="preserve">x</id> </boundVars> </function> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>3</real> </apply> <real>0</real> </localDefine> <if> <test> <apply> <greaterThan /> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">x</id> <real>1</real> </apply> </test> <then> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>0</real> </apply> <str xml:space="preserve">x>1</str> </localDefine> </program> </then> <elseif> <test> <apply> <greaterThan /> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">x</id> <real>2</real> </apply> </test> <then> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>1</real> </apply> <str xml:space="preserve">x>2</str> </localDefine> </program> </then> </elseif> <elseif> <test> <apply> <greaterThan /> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">x</id> <real>3</real> </apply> </test> <then> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>2</real> </apply> <str xml:space="preserve">x>3</str> </localDefine> </program> </then> </elseif> <else> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>3</real> </apply> <str xml:space="preserve">else</str> </localDefine> </program> </else> </if> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">R</id> </program> </define> </math> </region> <region id="ID0EQACS" top="57.600000000000009" left="288.00000000000006" height="81.4" width="116.48333333333335" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="25"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>0</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> </math> </region> <region id="ID0EZACS" top="153.60000000000002" left="288.00000000000006" height="81.4" width="116.48333333333335" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="27"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>1</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> </math> </region> <region id="ID0EHBCS" top="249.60000000000002" left="288.00000000000006" height="81.4" width="118.11000000000001" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="29"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>2</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> </math> </region> <region id="ID0EQBCS" top="345.6" left="288.00000000000006" height="81.4" width="118.11000000000001" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="31"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>3</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> </math> </region> <region id="ID0E5BCS" top="441.60000000000008" left="288.00000000000006" height="81.4" width="118.11000000000001" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="33"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>4</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> </math> </region>	<region id="ID0ESCCS" top="556.80000000000007" left="57.600000000000009" height="282.00000000000006" width="172.01333333333335" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="35"> <define xmlns="http://schemas.mathsoft.com/math50"> <function> <id labels="VARIABLE" xml:space="preserve">f</id> <boundVars> <id labels="VARIABLE" xml:space="preserve">x</id> </boundVars> </function> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>3</real> </apply> <real>0</real> </localDefine> <if> <test> <apply> <greaterThan /> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">x</id> <real>1</real> </apply> </test> <then> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>0</real> </apply> <str xml:space="preserve">x>1</str> </localDefine> </program> </then> <alsoif> <test> <apply> <greaterThan /> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">x</id> <real>2</real> </apply> </test> <then> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>1</real> </apply> <str xml:space="preserve">x>2</str> </localDefine> </program> </then> </alsoif> <alsoif> <test> <apply> <greaterThan /> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">x</id> <real>3</real> </apply> </test> <then> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>2</real> </apply> <str xml:space="preserve">x>3</str> </localDefine> </program> </then> </alsoif> <else> <program> <localDefine> <apply> <indexer /> <id labels="VARIABLE" xml:space="preserve">R</id> <real>3</real> </apply> <str xml:space="preserve">else</str> </localDefine> </program> </else> </if> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">R</id> </program> </define> <resultFormat> <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" /> </resultFormat> </math> </region> <region id="ID0EADCS" top="576.00000000000011" left="288.00000000000006" height="81.4" width="116.48333333333335" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="37"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>0</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> <resultFormat> <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" /> </resultFormat> </math> </region> <region id="ID0EJDCS" top="672.00000000000011" left="288.00000000000006" height="81.4" width="116.48333333333335" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="39"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>1</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> <resultFormat> <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" /> </resultFormat> </math> </region> <region id="ID0EXDCS" top="768.00000000000011" left="288.00000000000006" height="81.4" width="118.11000000000001" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="41"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>2</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> <resultFormat> <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" /> </resultFormat> </math> </region> <region id="ID0EAECS" top="864.00000000000011" left="288.00000000000006" height="81.4" width="118.11000000000001" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="43"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>3</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> <resultFormat> <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" /> </resultFormat> </math> </region> <region id="ID0EOECS" top="960.00000000000011" left="288.00000000000006" height="81.4" width="118.11000000000001" xmlns="http://schemas.mathsoft.com/worksheet50"> <math resultRef="45"> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">f</id> <real>4</real> </apply> <unitOverride> <placeholder /> </unitOverride> </eval> <resultFormat> <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" /> </resultFormat> </math> </region>

elseif

alsoif

Fare clic per copiare questa espressione

Se si utilizza elseif, il programma smette di valutare le istruzioni quando raggiunge la prima istruzione true. Quando si utilizza alsoif, il programma valuta tutte le istruzioni alsoif. Se una di esse è true, il programma non valuta alcuna delle istruzioni else successive.

Per ulteriori informazioni sull'utilizzo delle istruzioni condizionali, guardare il video seguente:

Argomenti correlati

Operatori condizionali

È stato utile?