• 코드:
 
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public class prog {
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    public static void main(String[] args) {
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        System.out.println(Math.ceil(10.0));        // 10.0
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        System.out.println(Math.ceil(10.1));        // 11.0
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        System.out.println(Math.ceil(10.000001));   // 11.0
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        System.out.println(Math.floor(10.0));       // 10.0
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        System.out.println(Math.floor(10.9));       // 10.0
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        System.out.println(Math.round(10.0));       // 10
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        System.out.println(Math.round(10.4));       // 10
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        System.out.println(Math.round(10.5));       // 11
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    }
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}
표준입력 & 실행옵션