📜  四八角形数

📅  最后修改于: 2021-04-23 19:17:48             🧑  作者: Mango

给定数N ,任务是找到N四对八边形数。

例子:

方法:第N个四八角形数由下式给出:

  • 侧多边形的第N个项= \frac{((s-2)n^2 - (s-4)n)}{2}
  • 因此48个面的多边形的第N个项是

下面是上述方法的实现:

C++
// C++ implementation for
// above approach
#include 
using namespace std;
 
// Function to find the
// nth Tetracontaoctagonal Number
int TetracontaoctagonalNum(int n)
{
    return (46 * n * n - 44 * n) / 2;
}
 
// Driver Code
int main()
{
    int n = 3;
    cout << TetracontaoctagonalNum(n);
 
    return 0;
}


Java
// Java program for above approach
class GFG{
 
// Function to find the
// nth TetracontaoctagonalNum Number
static int TetracontaoctagonalNum(int n)
{
    return (46 * n * n - 44 * n) / 2;
}
 
// Driver code
public static void main(String[] args)
{
    int n = 3;
    System.out.print(TetracontaoctagonalNum(n));
}
}
 
// This code is contributed by shubham


Python3
# Python3 Cimplementation for
# above approach
 
# Function to find the
# nth Tetracontaoctagonal Number
def TetracontaoctagonalNum(n):
 
    return (46 * n * n - 44 * n) / 2;
 
# Driver Code
n = 3;
print(TetracontaoctagonalNum(n));
 
# This code is contributed by Code_Mech


C#
// C# program for above approach
using System;
class GFG{
 
// Function to find the
// nth TetracontaoctagonalNum Number
static int TetracontaoctagonalNum(int n)
{
    return (46 * n * n - 44 * n) / 2;
}
 
// Driver code
public static void Main()
{
    int n = 3;
    Console.Write(TetracontaoctagonalNum(n));
}
}
 
// This code is contributed by Code_Mech


Javascript


输出:
141

参考: https : //en.wikipedia.org/wiki/Tetracontaoctagon