Question

我是Java新手，我想制作一个程序，通过键入你想要多少甜甜圈来计算甜甜圈的价格，然后根据你想要的甜甜圈数量告诉你价格是多少。

这是代码

    import java.util.Scanner;

class MyFirstProgram {
    public static void main(String args []){

        System.out.println("How many donuts do you want? Type in a number.");


        Scanner donuts = new Scanner(System.in);

        int price; price = 2;

        System.out.print("Price of " + donuts + " donuts is "); 
        System.out.println(donuts * price);


    }
}

我的代码中缺少什么？我在最后一行收到错误。我想我需要将甜甜圈声明为整数，这样我就可以将它与价格相乘。我需要做什么？

编辑：我明白了。这是现在的工作程序：

    import java.util.Scanner;

class MyFirstProgram {
    public static void main(String args []){

        System.out.println("Koliko krafna želiš? Upiši broj.");


        Scanner krafne = new Scanner(System.in);
        int num = krafne.nextInt();

        int cijena; cijena = 2;

        System.out.print("Cijena " + num + " krafni jest "); 
        System.out.print(num * cijena);
        System.out.println(" kn.");


    }
}

我用克罗地亚语写了这个节目。

Answer 1

甜甜圈是一个Scanner类对象而不是您的输入。替换你的行

        Scanner donuts = new Scanner(System.in);

以下

Scanner sc=new Scanner(System.in);
int donuts=sc.nextInt();

Answer 2

要获取输入表单控制台，您应该使用Scanner类对象

试试这个

import java.util.Scanner;

class MyFirstProgram { public static void main（String args []）{

    System.out.println("How many donuts do you want? Type in a number.");


    Scanner scr = new Scanner(System.in);
    int donuts = scr.nextInt();  /*scr is object of Scanner class and                       next int is used to take integer input*/

    int price; price = 2;

    System.out.print("Price of " + donuts + " donuts is "); 
    System.out.println(donuts * price);


}

}

Java用户输入，声明为int？

2 个答案: