2020.10.14日作业

第一题

package com.hp.zhang;

import com.sun.xml.internal.fastinfoset.tools.XML_SAX_StAX_FI;

public class test1 {
    public static void main(String[] args) {
       double c=sum(5,6);
        System.out.println("和为"+c);
    }
     public static double sum(int a,double b) {
         double sum = a + b;
         if (a == b) {
             System.out.println("两个数相等");
         } else {
             System.out.println("两个数不相等");
         }

   return sum;
     }}

第二题

package com.hp.zhang;

import com.sun.xml.internal.ws.api.model.wsdl.WSDLOutput;

public class test2 {
    public static void main(String[] args) {
        //长方形
        int chang = 10;
        int kuan = 5;
        int c = (chang + kuan) * 2;
        System.out.println("长方形的周长为" + c);
        int s = chang * kuan;
        System.out.println("长方形的面积为" + s);
        //圆
        int r = 5;
        double zhouchang = 2 * 3.14 * r;
        System.out.println("圆的周长"+zhouchang+"米");
        double mianji = 3.14*r*r;
        System.out.println("圆的周长"+mianji+"米");
    }

}

第三题

package com.hp.zhang;

public class test3 {
    public static void main(String[] args) {
        System.out.println("================================");
        int count2=0;
        int i=100;
        while(i<1000){
            int ge=i%10;
            int shi=i/10%10;
            int bai=i/10/10%10;
            if (ge*ge*ge+shi*shi*shi+bai*bai*bai==i) {
                System.out.println(i);
                count2++;
            }
            i++;
        }
        System.out.println("有水仙花数为："+count2+"个");
    }

}

第四题

package com.hp.zhang;

public class test4 {
    public static void main(String[] args) {
        for (int n =1; n <=11 ; n++) {
            System.out.println("HellowWord");
        }
        System.out.println();
    }
}

第五题

package com.hp.zhang;

public class test5 {
    public static void main(String[] args) {
        int sum=0;
        for (int i = 2; i <=100 ; i++) {
            if (i % 2 == 0) {

            }
            System.out.println(i);
             sum+=i;
        }
        System.out.println("所有偶数的和为"+sum);
        }}