日常学习2017..18

    昨天主要讲了嵌套循环，另外还有break为中断，打断 结束当前循环。continue继续，结束本次循环并且继续循环

嵌套循环三要素:外打行，内打列，找规律。其中比较经典的程序有打印一个正方形，下面是程序。

public static void main(String[] args) {for (int i = 1; i <= 5; i++) {for (int j = 1; j <= 10; j++) {System.out.print("*");}System.out.println();}

另外还有打印平行四边形

for(int i=1;i<=3;i++){  for (int k = 1; k<=3-i; k++) {System.out.print(" ");}  for (int j = 1; j<=5; j++) {System.out.print("*");}System.out.println("");

打印等腰三角形

for (int i = 1; i <= 3; i++) {for (int k = 1; k <= 3 - i; k++) {System.out.print(" ");}for (int j = 1; j <= 2 * i - 1; j++) {System.out.print("*");}System.out.println();和打印菱形
for (int i = 1; i <= 3; i++) {for (int k = 1; k <= 3 - i; k++) {System.out.print(" ");}for (int j = 1; j <= 2 * i - 1; j++) {System.out.print("*");}System.out.println();}for (int i = 2; i >= 1; i--) {for (int k = 1; k <= 3 - i; k++) {System.out.print(" ");}for (int j = 1; j <= 2 * i - 1; j++) {System.out.print("*");}System.out.println();}