016-while(){} do{}while();

[梵高摔电脑]

public class SumOfEven{

    public static void main(String[] args)

    {

        int i1 = 1,i2 = 1;  //define two variables

        int sum1 = 0,sum2 = 0;//initialize two viariables

        while(i1 <= 1000){      //while(){}

            if(0 == i1%2){              //如果i1除以2余数为0也就是i1是偶数

                sum1 = sum1+i1;   //这个i1加到和里。

            }

            i1++;    //自增

        }

        System.out.println("use while,1 to 1000,all the even's sum is :"+sum1); //打印和

        do{

            if(0 == i2%2){

                sum2 = sum2+i2;

            }

            i2++;

        }while(i2 <= 1000);

        System.out.println("use do-while,1 to 1000,all the even's sum is:"+sum2);

    }

}