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  1. using System;
  2.  
  3. namespace SquareProperties
  4. {
  5.     public class Program
  6.     {
  7.         public static void Main(string[] args)
  8.         {
  9.             Console.WriteLine("Введите сторону квадрата:");
  10.             double sideLength = Convert.ToDouble(Console.ReadLine());
  11.  
  12.             double perimeter = CalculatePerimeter(sideLength);
  13.             double area = CalculateArea(sideLength);
  14.  
  15.             Console.WriteLine($"Периметр квадрата: {perimeter}");
  16.             Console.WriteLine($"Площадь квадрата: {area}");
  17.         }
  18.  
  19.         public static double CalculatePerimeter(double side)
  20.         {
  21.             return 4 * side;
  22.         }
  23.  
  24.         public static double CalculateArea(double side)
  25.         {
  26.             return side * side;
  27.         }
  28.     }
  29. }
Success #stdin #stdout 0.05s 30676KB
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stdin
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Standard input is empty
stdout
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Введите сторону квадрата:
Периметр квадрата: 0
Площадь квадрата: 0
https://ideone.com/tR6GQs
language:
C# (NET 6.0)
created:
8 days ago
visibility:
public

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