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return statement

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C++
 
C++言語
一般的なトピック
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General topics
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フロー制御
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Flow control
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条件付き実行文
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Conditional execution statements
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Iteration statements
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Jump statements
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goto statement
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typedef declaration
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インラインアセンブリ
 
現在の関数を終了し、呼び出し元の関数に指定された値を返します。.
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Terminates current function and returns specified value to the caller function.
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目次

[編集] 構文

return expression (1)
return (2)

[編集] 説明

最初のバージョンは、expressionを評価し、現在の関数を終了し、呼び出し元の関数へexpressionの結果を返します。 expressionの結果の型は関数の戻り値の型に変換できる必要があります.
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The first version evaluates the expression, terminates the current function and returns the result of the expression to the caller function. The resulting type of the expression must be convertible to function return type.
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2番目のバージョンは、現在の関数を終了します。のみ有効な関数の戻り値の型はvoidある場合.
Original:
The second version terminates the current function. Only valid if the function return type is void.
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[編集] キーワード

return

[編集] 例

このコードを実行します
#include <iostream>
 
void fa(int i) 
{
    if (i == 2) return;
    std::cout << i << '\n';
}
 
int fb(int i) 
{
    if (i > 4) return 4;
    std::cout << i << '\n';
    return 2;
}
 
int main() 
{
    fa(2);
    fa(1);
    int i = fb(5);
    i = fb(i);
    std::cout << i << '\n';
}

出力: 

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