public static void Main()
class1 c1 = new class1();
Console.WriteLine("Main Menu\n");
Console.WriteLine("1.Area");
Console.WriteLine("2.Perimeter");
Console.WriteLine("3.Temperature");
Console.WriteLine("4.Exit");
int n = int.Parse(Console.ReadLine());
Console.WriteLine("\nInvalid Input Please Try Again!\n");
Console.WriteLine("\nProgram Terminated!\n");
Console.WriteLine("Area Menu\n");
Console.WriteLine("1.Area of Circle");
Console.WriteLine("2.Area of Rectangle");
Console.WriteLine("3.Area of Square");
Console.WriteLine("4.Area of Triangle");
Console.WriteLine("5.Exit");
int n = int.Parse(Console.ReadLine());
Console.Write("\nInput a radius : ");
int r = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe area of circle is : "+((double)Math.PI * Math.Pow(r, 2)) + "\n");
Console.Write("\nInput a length : ");
int l = int.Parse(Console.ReadLine());
Console.Write("Input a width : ");
int w = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe area of rectangle is : "+(l * w)+"\n");
Console.Write("\nInput a side : ");
int s = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe area of square is : "+((double)Math.Pow(s,2))+"\n");
Console.Write("\nInput a base : ");
int b = int.Parse(Console.ReadLine());
Console.Write("Input a height : ");
int h = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe area of square is : "+((double)1 / 2 * b * h)+"\n");
Console.WriteLine("\nInvalid Input Please Try Again!\n");
Console.WriteLine("Perimeter Menu\n");
Console.WriteLine("1.Circle");
Console.WriteLine("2.Rectangle");
Console.WriteLine("3.Square");
Console.WriteLine("4.Triangle");
Console.WriteLine("5.Exit");
int n = int.Parse(Console.ReadLine());
Console.Write("\nInput a radius : ");
int r = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe perimeter of circle is : "+((double)Math.PI * Math.Pow(r, 2))+"\n");
Console.Write("\nInput a length : ");
int l = int.Parse(Console.ReadLine());
Console.Write("Input a width : ");
int w = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe perimeter of rectangle is : "+((double)Math.Pow(l, 2) * Math.Pow(w, 2))+"\n");
Console.Write("\nInput a side : ");
int s = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe perimeter of square is : "+((double)Math.Pow(s,4))+"\n");
Console.Write("\nInput a side 1 : ");
int s1 = int.Parse(Console.ReadLine());
Console.Write("Input a side 2 : ");
int s2 = int.Parse(Console.ReadLine());
Console.Write("Input a side 3 : ");
int s3 = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe perimeter of triangle is : "+(s1 + s2 + s3)+"\n");
Console.WriteLine("\nInvalid Input Please Try Again!\n");
public void temperature()
Console.WriteLine("Temperature Menu\n");
Console.WriteLine("1.Celsius");
Console.WriteLine("2.Fahrenheit");
Console.WriteLine("3.Exit");
int n = int.Parse(Console.ReadLine());
Console.Write("\nInput a fahrenheit : ");
int f = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe celsius is : "+((double)5 / 9 * f - 32)+"\n");
Console.Write("\nInput a celsius : ");
int c = int.Parse(Console.ReadLine());
Console.WriteLine("\nThe fahrenheit is : "+((double)9 / 5 * c + 32)+"\n");
Console.WriteLine("\nInvalid Input Please Try Again!\n");