if statement

 

C

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一般的なトピック Original: General topics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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C
フロー制御 Original: Flow control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
条件付き実行文 Original: Conditional execution statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
if statement	switch statement
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for loop	while loop do-while loop
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インラインアセンブリ

 

条件付きでコードを実行.

Original:

Conditionally executes code.

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コー​​ドには、いくつかの条件が存在する場合にのみ実行する必要がある場合に使用.

Original:

Used where code needs to be executed only if some condition is present.

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構文

if ( expression ) statement_true
if ( expression ) statement_true else statement_false

説明

expressionは、boolに変換式でなければならない.

Original:

expression shall be an expression, convertible to bool.

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それはtrueに評価された場合、制御がstatement_trueに渡され、statement_false（存在する場合）が実行されません.

Original:

If it evaluates to true, control is passed to statement_true, statement_false (if present) is not executed.

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そうしないと、コントロールがstatement_falseに渡され、statement_trueは実行されません.

Original:

Otherwise, control is passed to statement_false, statement_true is not executed.

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キーワード

if, else

例

#include <stdio.h>
 
int main()
{
    int i = 2;
    if (i > 2) {
        printf("first is true\n");
    } else {
        printf("first is false\n");
    }
 
    i = 3;
    if (i == 3) printf("i == 3\n");
 
    if (i != 3) printf("i != 3\n");
    else        printf("i != 3 is false\n");
}

Output:

first is false
i == 3
i != 3 is false