Question

我想得到所有的num值并打印到（......）但我无法做到这一点。你可以帮帮我吗？

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Scanner keyboard = new Scanner(System.in);
    int operands,num;
    int q=1;
    int a=0;

    do 
    {
        System.out.println("Enter the number of operands (in range 2-10):");
        operands=keyboard.nextInt();            
    } while ((operands<2) || (operands>10));

    for (int number=1; number<=operands; number++)
    {
        System.out.println("Enter number "+number+":");
        num=keyboard.nextInt();
        q=q*num;
    }

    System.out.print("Multiplication of numbers "+(.......)+" is: "+q);

Answer 1

我喜欢FranzKnut的回答，但如果性能问题，即使它不是，那么请考虑使用字符串生成器。

在使用循环之前

StringBuilder sb = new StringBuilder("my numbers are: ");

在循环内添加以下代码。

sb.append(num);

然后在循环结束时你有类似

的东西

System.out.println(sb.toString());

Answer 2

使用在循环之前声明的其他String变量：

String numbers=" ";

并在循环体中添加它：

numbers += num+" ";

然后在（.......）

的位置打印出这个字符串

Answer 3

只需在程序中添加一个String，然后使用新添加的数字进行连接。最后打印您必须打印的字符串。

t1

Answer 4

好的，你有

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Numbers {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner keyboard = new Scanner(System.in);
        int operands,num;
        int q=1;
        int a=0;
        List<Integer> numbers = new ArrayList<Integer>();
        int newNumbers = 1;

        do 
        {
            System.out.println("Enter the number of operands (in range 2-10):");
            operands=keyboard.nextInt();        

        } while ((operands<2) || (operands>10));

        for (int number=1; number<=operands; number++)
        {
            System.out.println("Enter number "+number+":");
            num=keyboard.nextInt();
            q=q*num;
            numbers.add(num);
        }
        StringBuilder newTextNumber = new StringBuilder("");
        for(Integer s: numbers){
            newTextNumber.append(s).append(" ");
            newNumbers *= s;
        }


        System.out.print("Multiplication of numbers "+newTextNumber+" is: "+newNumbers);
     }
}

Enter the number of operands (in range 2-10):
3
Enter number 1:
20
Enter number 2:
30
Enter number 3:
10
Multiplication of numbers 20 30 10  is: 6000

从for循环中获取值？

4 个答案: