程序打印一半钻石星型图案

给定整数N ，任务是打印半钻石星型图案。

*
**
***
****
*****
******
*****
****
***
**
*

例子：

Input: N = 3
Output:
*
**
***
**
*

Input: N = 6
Output:
*
**
***
****
*****
******
*****
****
***
**
*

方法：想法是将模式分为上半部分和下半部分两个部分。然后在循环的帮助下分别打印。打印上半部分和下半部分的主要注意事项如下：

• 上半部：模式的上半部按升序包含星号‘*’ ，其中^第i行包含以下星号：

  的“*”在^第i行号= $i$

• 下半部：模式的下半部按降序包含星号‘*’ ，其中^第i行包含以下星号：

  的“*”在^第i行号= $N - i$

  下面是上述方法的实现：

  C++

  // C++ implementation to print the
  // half diamond star pattern
    
  #include 
    
  using namespace std;
    
  // Function to print the
  // half diamond star pattern
  void halfDiamondStar(int N)
  {
      int i, j;
    
      // Loop to print the upper half
      // diamond pattern
      for (i = 0; i < N; i++) {
          for (j = 0; j < i + 1; j++)
              cout << "*";
          cout << "\n";
      }
    
      // Loop to print the lower half
      // diamond pattern
      for (i = 1; i < N; i++) {
          for (j = i; j < N; j++)
              cout << "*";
          cout << "\n";
      }
  }
    
  // Driver Code
  int main()
  {
      int N = 5;
    
      // Function Call
      halfDiamondStar(N);
  }

  Java

  // Java implementation to print the
  // half diamond star pattern
  import java.util.*;
    
  class GFG{
    
  // Function to print the
  // half diamond star pattern
  static void halfDiamondStar(int N)
  {
      int i, j;
    
      // Loop to print the upper half
      // diamond pattern
      for (i = 0; i < N; i++)
      {
          for (j = 0; j < i + 1; j++)
               System.out.print("*");
          System.out.print("\n");
      }
    
      // Loop to print the lower half
      // diamond pattern
      for (i = 1; i < N; i++) 
      {
          for (j = i; j < N; j++)
               System.out.print("*");
          System.out.print("\n");
      }
  }
    
  // Driver Code
  public static void main(String[] args)
  {
      int N = 5;
    
      // Function Call
      halfDiamondStar(N);
  }
  }
    
  // This code is contributed by Rohit_ranjan

  Python3

  # Python3 implementation to print the 
  # half diamond star pattern 
    
  # Function to print the 
  # half diamond star pattern 
  def halfDiamondStar(N):
        
      # Loop to print the upper half 
      # diamond pattern 
      for i in range(N):
    
          for j in range(0, i + 1):
              print("*", end = "")
          print()
    
      # Loop to print the lower half 
      # diamond pattern 
      for i in range(1, N):
    
          for j in range(i, N):
              print("*", end = "")
          print()
    
  # Driver Code 
  N = 5; 
    
  # Function Call 
  halfDiamondStar(N);
    
  # This code is contributed by skylags

  C#

  // C# implementation to print the
  // half diamond star pattern
  using System;
    
  class GFG{
    
  // Function to print the
  // half diamond star pattern
  static void halfDiamondStar(int N)
  {
      int i, j;
    
      // Loop to print the upper half
      // diamond pattern
      for(i = 0; i < N; i++)
      {
         for(j = 0; j < i + 1; j++)
             Console.Write("*");
         Console.Write("\n");
      }
    
      // Loop to print the lower half
      // diamond pattern
      for(i = 1; i < N; i++) 
      {
         for(j = i; j < N; j++)
             Console.Write("*");
         Console.Write("\n");
      }
  }
    
  // Driver Code
  public static void Main(String[] args)
  {
      int N = 5;
    
      // Function Call
      halfDiamondStar(N);
  }
  }
    
  // This code is contributed by Rohit_ranjan

  输出：

  *
  **
  ***
  ****
  *****
  ****
  ***
  **
  *