Using Conditional Statements

Operators > Programming Operators > Using Conditional Statements

Using Conditional Statements

You can use the conditional operators for defining functions. You can then evaluate the conditional statement at a point as follows:

elseif

alsoif

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<region id="ID0EH6QQ" 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>

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<region id="ID0EECRQ" 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>

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When you use elseif, the program stops evaluating statements when it reaches the first true statement. When you use alsoif, the program evaluates all alsoif statements. If any of them are true, the program does not evaluate any of the following else statements.