作業2.一元二次方向根を判断する場合

 1 using System;

 2 using System.Collections.Generic;

 3 using System.Linq;

 4 using System.Text;

 5 

 6 namespace ConsoleApplication1

 7 {

 8     class Program

 9     {

10         static void Main(string[] args)

11         {

12             // 

13             Console.Write(" a,b,c ");

14             string a1 = Console.ReadLine();

15             string b1 = Console.ReadLine();

16             string c1 = Console.ReadLine();

17             int a = Convert.ToInt32(a1);

18             int b = Convert.ToInt32(b1);

19             int c = Convert.ToInt32(c1);

20 

21             if (a == 0)

22             {

23                 Console.WriteLine(" ");

24             }

25             else

26             {

27                 int d = b * b - 4 * a * c;

28                 if (d < 0)

29                 {

30                     Console.WriteLine(" ");

31                 }

32                 else if (d == 0)

33                 {

34                     Console.WriteLine(" ");

35                 }

36                 else

37                 {

38                     Console.WriteLine(" ");

39                 }

40             }

41 

42         }

43     }

44 }