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[Source] Java input lines print diamonds

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Posted on 10/15/2014 7:41:37 AM | | |
  1. package cn.jbit.nestedloops;
  2. import java.util.Scanner;
  3. /**
  4. * 输入行数打印菱形
  5. */
  6. public class Diamond {
  7.         public static void main(String[] args) {
  8.                 int rows = 0;        //菱形的行数
  9.                 Scanner input = new Scanner(System.in);
  10.                 System.out.print("请输入菱形行数：");
  11.                 rows = input.nextInt();

  13.                 while(rows%2 == 0){
  14.                         System.out.print("请输入奇数：");
  15.                         rows = input.nextInt();
  16.                 }

  18.                 int n = (rows+1)/2;
  19.                 //打印菱形的上半部分
  20.                 for(int i = 1; i <= n; i++){//外层循环变量i控制行数
  21.                         for(int j = 1; j <= n-i; j++){//内层循环变量j控制该行空格数
  22.                                 System.out.print(" ");
  23.                         }
  24.                         for(int k = 1; k <= 2*i-1; k++){//内层循环变量k控制该行*号数
  25.                                 System.out.print("*");
  26.                         }
  27.                         System.out.print("\n");
  28.                 }
  29.                 //打印菱形的下半部分
  30.                 for(int i = n-1; i >= 1; i--){
  31.                         for(int j = 1; j <= n-i; j++){
  32.                                 System.out.print(" ");
  33.                         }
  34.                         for(int k = 1; k <= 2*i-1; k++){
  35.                                 System.out.print("*");
  36.                         }
  37.                         System.out.print("\n");
  38.                 }
  39.         }
  40. }
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