使用條件語句

運算子 > 程式設計運算子 > 使用條件語句

使用條件語句

您可以使用條件運算子定義函數，然後即可在下列情況中計算條件語句：

elseif

alsoif

按一下以複製此運算式

<region id="ID0E22QS" top="38.400000000000006" left="57.600000000000009" xml:lang="zh_TW" height="282.00000000000006" width="172.01333333333335" xmlns="http://schemas.mathsoft.com/worksheet50">
  <math resultRef="23" xml:lang="zh_TW">
    <define xml:lang="zh_TW" xmlns="http://schemas.mathsoft.com/math50">
      <function xml:lang="zh_TW">
        <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">f</id>
        <boundVars xml:lang="zh_TW">
          <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">x</id>
        </boundVars>
      </function>
      <program xml:lang="zh_TW">
        <localDefine xml:lang="zh_TW">
          <apply xml:lang="zh_TW">
            <indexer xml:lang="zh_TW" />
            <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
            <real xml:lang="zh_TW">3</real>
          </apply>
          <real xml:lang="zh_TW">0</real>
        </localDefine>
        <if xml:lang="zh_TW">
          <test xml:lang="zh_TW">
            <apply xml:lang="zh_TW">
              <greaterThan xml:lang="zh_TW" />
              <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">x</id>
              <real xml:lang="zh_TW">1</real>
            </apply>
          </test>
          <then xml:lang="zh_TW">
            <program xml:lang="zh_TW">
              <localDefine xml:lang="zh_TW">
                <apply xml:lang="zh_TW">
                  <indexer xml:lang="zh_TW" />
                  <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                  <real xml:lang="zh_TW">0</real>
                </apply>
                <str xml:space="preserve" xml:lang="zh_TW">x>1</str>
              </localDefine>
            </program>
          </then>
          <elseif xml:lang="zh_TW">
            <test xml:lang="zh_TW">
              <apply xml:lang="zh_TW">
                <greaterThan xml:lang="zh_TW" />
                <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">x</id>
                <real xml:lang="zh_TW">2</real>
              </apply>
            </test>
            <then xml:lang="zh_TW">
              <program xml:lang="zh_TW">
                <localDefine xml:lang="zh_TW">
                  <apply xml:lang="zh_TW">
                    <indexer xml:lang="zh_TW" />
                    <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                    <real xml:lang="zh_TW">1</real>
                  </apply>
                  <str xml:space="preserve" xml:lang="zh_TW">x>2</str>
                </localDefine>
              </program>
            </then>
          </elseif>
          <elseif xml:lang="zh_TW">
            <test xml:lang="zh_TW">
              <apply xml:lang="zh_TW">
                <greaterThan xml:lang="zh_TW" />
                <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">x</id>
                <real xml:lang="zh_TW">3</real>
              </apply>
            </test>
            <then xml:lang="zh_TW">
              <program xml:lang="zh_TW">
                <localDefine xml:lang="zh_TW">
                  <apply xml:lang="zh_TW">
                    <indexer xml:lang="zh_TW" />
                    <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                    <real xml:lang="zh_TW">2</real>
                  </apply>
                  <str xml:space="preserve" xml:lang="zh_TW">x>3</str>
                </localDefine>
              </program>
            </then>
          </elseif>
          <else xml:lang="zh_TW">
            <program xml:lang="zh_TW">
              <localDefine xml:lang="zh_TW">
                <apply xml:lang="zh_TW">
                  <indexer xml:lang="zh_TW" />
                  <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                  <real xml:lang="zh_TW">3</real>
                </apply>
                <str xml:space="preserve" xml:lang="zh_TW">else</str>
              </localDefine>
            </program>
          </else>
        </if>
        <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">R</id>
      </program>
    </define>
  </math>
</region>

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

<region id="ID0ED6QS" top="556.80000000000007" left="57.600000000000009" xml:lang="zh_TW" height="282.00000000000006" width="172.01333333333335" xmlns="http://schemas.mathsoft.com/worksheet50">
  <math resultRef="35" xml:lang="zh_TW">
    <define xml:lang="zh_TW" xmlns="http://schemas.mathsoft.com/math50">
      <function xml:lang="zh_TW">
        <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">f</id>
        <boundVars xml:lang="zh_TW">
          <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">x</id>
        </boundVars>
      </function>
      <program xml:lang="zh_TW">
        <localDefine xml:lang="zh_TW">
          <apply xml:lang="zh_TW">
            <indexer xml:lang="zh_TW" />
            <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
            <real xml:lang="zh_TW">3</real>
          </apply>
          <real xml:lang="zh_TW">0</real>
        </localDefine>
        <if xml:lang="zh_TW">
          <test xml:lang="zh_TW">
            <apply xml:lang="zh_TW">
              <greaterThan xml:lang="zh_TW" />
              <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">x</id>
              <real xml:lang="zh_TW">1</real>
            </apply>
          </test>
          <then xml:lang="zh_TW">
            <program xml:lang="zh_TW">
              <localDefine xml:lang="zh_TW">
                <apply xml:lang="zh_TW">
                  <indexer xml:lang="zh_TW" />
                  <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                  <real xml:lang="zh_TW">0</real>
                </apply>
                <str xml:space="preserve" xml:lang="zh_TW">x>1</str>
              </localDefine>
            </program>
          </then>
          <alsoif xml:lang="zh_TW">
            <test xml:lang="zh_TW">
              <apply xml:lang="zh_TW">
                <greaterThan xml:lang="zh_TW" />
                <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">x</id>
                <real xml:lang="zh_TW">2</real>
              </apply>
            </test>
            <then xml:lang="zh_TW">
              <program xml:lang="zh_TW">
                <localDefine xml:lang="zh_TW">
                  <apply xml:lang="zh_TW">
                    <indexer xml:lang="zh_TW" />
                    <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                    <real xml:lang="zh_TW">1</real>
                  </apply>
                  <str xml:space="preserve" xml:lang="zh_TW">x>2</str>
                </localDefine>
              </program>
            </then>
          </alsoif>
          <alsoif xml:lang="zh_TW">
            <test xml:lang="zh_TW">
              <apply xml:lang="zh_TW">
                <greaterThan xml:lang="zh_TW" />
                <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">x</id>
                <real xml:lang="zh_TW">3</real>
              </apply>
            </test>
            <then xml:lang="zh_TW">
              <program xml:lang="zh_TW">
                <localDefine xml:lang="zh_TW">
                  <apply xml:lang="zh_TW">
                    <indexer xml:lang="zh_TW" />
                    <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                    <real xml:lang="zh_TW">2</real>
                  </apply>
                  <str xml:space="preserve" xml:lang="zh_TW">x>3</str>
                </localDefine>
              </program>
            </then>
          </alsoif>
          <else xml:lang="zh_TW">
            <program xml:lang="zh_TW">
              <localDefine xml:lang="zh_TW">
                <apply xml:lang="zh_TW">
                  <indexer xml:lang="zh_TW" />
                  <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW">R</id>
                  <real xml:lang="zh_TW">3</real>
                </apply>
                <str xml:space="preserve" xml:lang="zh_TW">else</str>
              </localDefine>
            </program>
          </else>
        </if>
        <id labels="VARIABLE" xml:space="preserve" xml:lang="zh_TW" label-is-contextual="true">R</id>
      </program>
    </define>
    <resultFormat xml:lang="zh_TW">
      <matrix size="12,12" offset="0,0" show-indices="false" expand-nested-arrays="false" xml:lang="zh_TW" />
    </resultFormat>
  </math>
</region>

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

按一下以複製此運算式

當您使用 elseif 時，該程式會在達到第一個為真的語句時，停止計算語句。當您使用 alsoif 時，該程式會計算所有 alsoif 語句。若以上任一項為真，則該程式不會計算下列任何一個 else 語句。