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if statement

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Flow control
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Conditional execution statements
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if statement
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Iteration statements
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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.
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Used where code needs to be executed only if some condition is present.
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目次

[編集] 構文

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

[編集] 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.
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Otherwise, control is passed to statement_false, statement_true is not executed.
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[編集] キーワード

if, else

[編集]

#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