Java逻辑错误-未显示十位小数

我的程序允许用户计算两个数字，然后根据用户输入的运算符执行简单的计算。所以我的源代码是：

    System.out.print("Enter First Number: ");
    int num1 = scanNum.nextInt();
    
    System.out.print("Enter Second Number: ");
    int num2 = scanNum.nextInt();
    
    System.out.print("Enter Operator (+, -, * or /): ");
    char opt = scanOpt.next().charAt(0);
    
    scanNum.close();
    scanOpt.close();
    
    
    switch (opt)    
    {
        case '+':
            float result = num1 + num2;
            System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
            break;
            
        case '-':
            result = num1 - num2;
            System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
            break;
        
        case '*':
            result = num1 * num2;
            System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
            break;
        
        case '/':
            result = num1 / num2;
            System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
            break;
        
        default:
            System.out.println("Invalid Operator!");
            break;

它工作得很好，但是每当它将两个数字分开，例如“6.0/4.0”，第十个小数就不会出现。正确的输出应为：

Enter First Number: 6
Enter Second Number: 4
Enter Operator (+, -, * or /): /
6 / 4 = 1.5

但使用我自己的源代码，输出是：

Enter First Number: 6
Enter Second Number: 4
Enter Operator (+, -, * or /): /
6 / 4 = 1.0

---

之所以会出现这种情况，是因为Java将两个整数相除，从而产生一个整数输出。 尝试将输入声明为float 或者是另一种方式

1.0*num1/num2

---

这将num1“转换”为浮点值。

@Ivar i已将数据类型更改为double，但它仍然不起作用。

num1

或

num2

必须是十进制类型。如果您将其中一个强制转换为

float

或

double

，它将起作用。像

result=（double）num1/num2

。已经工作了，谢谢！我已经将num1和num2转换成了double，并且成功了。但这一次也起了作用。谢谢你！

        double result;
        switch (opt)    
        {
            case '+':
                result = (double) num1 + num2;
                System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
                break;
                
            case '-':
                result = (double)num1 - num2;
                System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
                break;
            
            case '*':
                result = (double) num1 * num2;
                System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
                break;
            
            case '/':
                result = (double) num1 / num2;
                System.out.println(num1 + " " + opt + " " + num2 + " = " +result);
                break;
            
            default:
                System.out.println("Invalid Operator!");
                break;
        }