java實例練習

1.不使用中間變量交換兩個數

public class Exchange {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入一個整數：");
        Long num1 = scanner.nextLong();
        System.out.println("請輸入一個整數：");
        Long num2 = scanner.nextLong();
        System.out.println("交換前num1:"+num1+"     交換前num2:"+num2 );
        num1 = num1^num2;
        num2 = num2^num1;
        num1 = num1^num2;
        System.out.println("交換後num1:"+num1+"     交換後num2:"+num2 );
    }
}

Exchange

2.利用三目運算符判斷奇偶性

public class ParityCheck {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入一個整數：");
        Long num = scanner.nextLong();
        String s = (num%2==0)?"這個數是：偶數":"這個數是：奇數";
        System.out.println(s);
    }
}

ParityCheck