switch statement
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一体型の引数の値に応じてコードを実行します
Original:
Executes code according to value of an integral argument
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どこで使用されるコードの多くの枝の1つまたはいくつかのうち、積分値に応じて実行する必要が.
Original:
Used where one or several out of many branches of code need to be executed according to an integral value.
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目次 |
[編集] 構文
switch ( expression ) {
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[編集] 説明
expressionは、整数値に変換式でなければならない.
Original:
expression shall be an expression, convertible to an integer value.
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すべてconstant_expressionsは、この
switch文内で一意となる整数値に変換定数式でなければならないOriginal:
All constant_expressions shall be constant expressions, convertible to an integer value, which is unique within this
switch statementThe text has been machine-translated via Google Translate.
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expressionが定義constant_expressioniのいずれかの値に等しい値に評価される場合は、statementi（存在する場合）およびそれ以降のすべてのステートメント（default_statement除いて、存在する場合）が実行されます。 expressionの値がconstant_expressionsのいずれとも一致しない場合は、存在する場合、default_statementが実行されます.
が使用可能であることを、覚えておくと便利です。その場合Original:
If the expression evaluates to a value, equal to the value of one of the defined constant_expressioni, the statementi (if present) and all subsequent statements (except default_statement, if present) are executed. If the value of the expression does not match any of the constant_expressions, the default_statement is executed if present.
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switch文の実行は終了します. Original:
It is useful to note, that if the execution of subsequent statements is undesirable, the
ステートメントを破る</div> can be used. In that case the execution of the
Original:
break statement
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switch statement terminates. The text has been machine-translated via Google Translate.
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[編集] キーワード
[編集] 例
次のコードは、スイッチ'文のいくつかの使用例を示しています
Original:
The following code shows several usage cases of the switch statement
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このコードを実行します
#include <iostream> int main() { int i = 2; switch (i) { case 1: std::cout << "1"; case 2: std::cout << "2"; //execution starts at this case label case 3: std::cout << "3"; case 4: case 5: std::cout << "45"; break; //execution of subsequent statements is terminated case 6: std::cout << "6"; } std::cout << '\n'; switch (i) { case 4: std::cout << "a"; default: std::cout << "d"; //there are no applicable constant_expressions //therefore default_statement is executed } std::cout << '\n'; switch (i) { case 4: std::cout << "a"; //nothing is executed } }
出力:
2345 d
