Java-循环控制语句

package myOperator;

/**
 * Created by JackFeng on 2020/2/26.
 */

/*
* for循环语句的格式：
*   for(初始化语句;判断条件语句;控制条件语句）{
*       循环体语句：
*
* }
*
* */

public class ForDemo {

    public static void main(String[] args) {

//        输出10次 hello
        for (int i=1;i<=10;i++){
            System.out.println("hello"+i);
        }

        // 获取 1-5
        for (int x =1 ;x <=5;x++){
            System.out.println("-----");
            System.out.println(x);
        }

        // 获取 5-1
        for (int x = 5; x >= 1; x--) {
            System.out.println("======");
            System.out.println(x);
        }

        // 1-5 求和

        //初始化值为0

        int sum = 0;
        for (int x =1;x<=5;x++){
            sum = sum + x;
//            sum += x;
            System.out.println("累加值为:"+sum);

        }
        System.out.println("sum"+sum);

    }
}

        // 结果：2550
        int s = 0;
        for (int x =1;x<=100;x++){
            if (x%2 ==0){
                s += x;
            }
        }
        System.out.println("1-100偶数求和为："+s);

        //经典案例 水仙花数
        // EG: 153
        // 个位：153%10
        // 十位：153/10%10
        // 百位：153/10/10%10
        int count = 0;

        for (int x=100;x<=999;x++){
            int gw =x % 10;
            int sw =x/10 % 10;
            int bw =x/10/10 % 10;
            if ((gw*gw*gw +sw*sw*sw + bw*bw*bw )==x){
                System.out.println(x);
                count++; //统计次数
            }
        }
        //输出统计值
        System.out.println(count);

package myOperator;

/**
 * Created by JackFeng on 2020/2/26.
 */
public class WhileDemo {

    public static void main(String[] args) {

        // 输出10次 你好
        // for 实现

        for (int i =1;i<=10;i++){
            System.out.println("你好");
        }

        // while 实现

        int s = 1;
        while (s<=10){
            System.out.println("Nihao");
            s++;
        }


    }

}

package myOperator;

/**
 * Created by JackFeng on 2020/2/26.
 */
public class DoWhileDemo {

    public static void main(String[] args) {
        // 输出10次 HI

        for (int i =1;i<=10;i++){
            System.out.println("Hi");
        }

        // do while 改写

        int x = 1;
        do {
            // 循环体语句
            System.out.println("HI hi");
            // 控制条件语句
            x++;
        }
        // 判断体语句
        while (x <= 10);



    }

}

package myOperator;

/**
 * Created by JackFeng on 2020/2/26.
 */
public class XunDemo {

    public static void main(String[] args) {

        int x = 3;
        while(x <3){
            System.out.println("while 循环体");
            x++;
        }


        int y = 3;
        do {
            System.out.println(" do while 循环ti ");
            y++;
        } while (y < 3);
    }
}

    // for 和 while 的区别

    public static void main(String[] args) {

        //for
        for (int i = 0; i <5 ; i++) {
            System.out.println("这里是for循环");
        }
//        System.out.println("i:"+i); 这里是调用不了的

        //while

        int x =0;
        while (x<5){
            System.out.println("while循环");
            x++;
        }
        System.out.println("x:"+x);
        

    }