java - 代码中的数字问题

Question

我的代码有一些问题。当我编译它直到达到数字相除的点时它工作得很好。我没有得到带小数的数字，只有零。正如您所看到的，我已经将最后一个变量更改为双倍，但它没有任何有意义的结果。

我必须做什么才能改变这种情况？

        int[] arr = new int[2];
        System.out.println("enter two numbers: ");
        arr[0] = sc.nextInt();
        arr[1] = sc.nextInt();

        int summa = arr[0]+arr[1];

        System.out.println("What's "+arr[0]+" + "+arr[1]+" ?");
        int vad = sc.nextInt();

        if (summa == vad)
            System.out.println("Correct!");
        else
            System.out.println("Wrong - The right answer is "+summa);


        int summa2 = arr[0]-arr[1];
        System.out.println("What's "+arr[0]+" - "+arr[1]+" ?");
        int vad2 = sc.nextInt();

        if (summa2 == vad2)
            System.out.println("Correct!");
        else
            System.out.println("Wrong - The right answer is: "+summa2);


        int summa3 = arr[0]*arr[1];
        System.out.println("What's "+arr[0]+" * "+arr[1]+" ?");
        int vad3 = sc.nextInt();

        if (summa3 == vad3)
            System.out.println("Correct!");
        else
            System.out.println("Wrong - The right answer is "+summa3);


        double summa4 = arr[0]/arr[1];
        System.out.println("What's "+arr[0]+" / "+arr[1]+" ?");
        double vad4 = sc.nextInt();

        if (summa4 == vad4)
            System.out.println("Correct!");
        else
            System.out.println("Wrong - The right answer is "+summa4);



}

}

Answer 1

1您正在阅读int，它应该是double。
2 您需要转换为双检查下面的代码

    double summa4 = ((double)arr[0])/arr[1];
    System.out.println("What's "+arr[0]+" / "+arr[1]+" ?");
    double vad4 = sc.nextDouble();

    if (summa4 == vad4)
        System.out.println("Correct!");
    else
        System.out.println("Wrong - The right answer is "+summa4);