java - 完全数法

Question

该程序应该接受用户输入并确定它是否是完美数。当我尝试编译它时，出现错误 Method testPerfect in class scalvert_Perfect can not be apply to given types;

• testPerfect(num);
• 必需:int，int
• 发现:整数
• 原因:实际参数列表和形式参数列表的长度不同

我的代码:

import java.util.Scanner;

public class scalvert_Perfect
{
public static void main ( String args[] ) 
{
    Scanner input = new Scanner(System.in);
    int test;
    int num = 0;
    int counter = 0;

    do
    {
        System.out.print("How many numbers would you like to test? ");
        test = input.nextInt();

    }while(test < 1);

    do
    {
        System.out.print("Please enter a possible perfect number: ");
        num = input.nextInt();

        testPerfect(num);
        printFactors(num);

        counter++;

    }while(counter < test);
}


    public static boolean testPerfect(int num, int test)
    {
        int sum = 0;

        for(int i = 0; i < test ; i++)
            {
                if(num % i == 0)
                {
                sum += i;
                }       

            }
                if(sum == num)
                {
                return true;
                }
                else
                {
                return false;
                }
    }       

    public static void printFactors(int num)
    {
        int x;
        int sum = 0;

        for(int factor = num - 1 ; factor > 0; factor--)
            {
                x = num % factor;

                if (x == 0)
                {
                    sum = sum+factor;
                }
            }
                if(sum != num)
                {
                    System.out.printf("%d:NOT PERFECT",num);
                }

            if(sum == num)
                {       
                    System.out.printf("%d: ",num);

                        for(int factor=1; factor < num; factor++)
                            {       
                                x = num % factor;
                                if(x == 0)
                                {
                                    System.out.printf("%d ",factor);
                                }
                            }               
                }
                System.out.print("\n");
                sum = 0;
    }


}

Answer 1

您的函数需要两个整数，因为:

public static boolean testPerfect(int num, int test)

你在这里用 1 个整数来调用它:

 testPerfect(num);

顺便说一句，这正是错误所说的:

功能:

testPerfect(num);

需要两个整数

required :int, int

但是你用一个来调用它:

found: int

所以错误是因为参数数量不正确:

reason: actual and formal argument list differ in length