java - y 的原始类型 int 编译时没有字段

Question

我正在编写一个程序来对从用户那里获得的整数执行一些算术运算。我不断收到有关减法变量不是基本类型 int 的错误。

import java.util.Scanner;

//This program is used to display the sum, product, difference and quotient of two numbers

public class test6 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        //Create a scanner to obtain user input
        Scanner input = new Scanner(System.in);

        int x,y; //Declare the two integer variables
        int sum, product;
        double quotient;
        long subtract;

        System.out.println("Enter the first integer: "); //Prompt user for input
        x = input.nextInt(); //Read first integer

        System.out.println("Enter the second integer: "); //Prompt user for input
        y = input.nextInt(); //Read second integer

        sum = x + y; //Calculate the sum of the two integers
        subtract = x - y; //Calculate the subtract of the two integer
        product = x * y; //Calculate the product of the two integers
        quotient = x % y; //Calculate the quotient of the two integers

        System.out.printf("The sum of %d and %d is %d", x , y, sum);

        System.out.printf("The difference of %d and %d is %d", x , y. subtract);

        System.out.printf("The product of %d and %d is %d", x , y, product);

        System.out.printf("The quotient of %d and %d is %d", x , y , quotient);

    }

}

Answer 1

您只是在一行中有一个拼写错误

 System.out.printf("The difference of %d and %d is %d", x , y. subtract);

将点更改为逗号。正如 @Kevin 指出的，编译器尝试将 subtract 解析为 int 变量上的字段。

System.out.printf("The difference of %d and %d is %d", x , y, subtract);