Hybrid operations (console)

Using system;using system.collections.generic;using system.linq;using system.text;using        System.text.regularexpressions;namespace consoleapplication2{class Program {static int sun;        private static int x, y, Z;        private static string F;        private static string H;            static void Main (string[] args) {Console.Write ("Please enter the range of random numbers (9-10):");            String azzz = Console.ReadLine ();            string regex = @ "(\d+) \d+ (\d+)";            Match MSTR = Regex.match (azzz, Regex); int s1 = Int. Parse (MSTR. GROUPS[1].            Value); int s2 = Int. Parse (MSTR. GROUPS[2].            Value);            Random (S1,S2);            Console.Write ("Please enter answer:"); int l = Int.            Parse (Console.ReadLine ());            Rightanswer (F, h, X, Y, z); if (L = = Sun) {Console.WriteLine ("Answer right!")            "); } else {Console.WriteLine ("Answer Error!            ");        } console.read (); }        private static void random (int a,int b) {Random si = new random (); x = Si.            Next (A, b); y = si.            Next (A, x); z = si.            Next (A, y);             string[] operators = new string[] {"+", "-", "*", "/"}; f = operators[new Random ().             Next (0, 4)]; h = operators[new Random ().            Next (0, 4)];            String z1 = "=";            String xfyhz = x + F + y + H + z + z1;        Console.WriteLine (xfyhz); } private static int Rightanswer (String a1, string a2, int c, int d, int e) {string A12 = A1 + A            2;                    Switch (A12) {case "+ +": Sun = C + D + E;                Break                    Case "+-": Sun = c + d-e;                Break                    Case "-+": Sun = c-d + E;                Break                    Case "--": Sun = c-d-E;        Break        Case "-*": Sun = c-d * e;                Break                    Case "+*": Sun = C + D + E;                Break                    Case "* *": Sun = c * D/E;                Break                    Case "* *": Sun = c * d * e;                Break                    Case "* *": Sun = c + d-e;                Break                    Case "*+": Sun = c * D + E;                Break                    Case "/*": Sun = C/D * e;                Break                    Case "/-": Sun = C/D-E;                Break                    Case "/+": Sun = C/D + E;                Break                    Case "//": Sun = C/D/E;                Break                    Case "-/": Sun = c-d/E;                Break              Case "+/":      Sun = c + d/e;            Break        } return Sun; }    }}

Summarize:
It's been a long time, and it's a little bit of detail that will determine if the program is running successfully! Write code should be careful, carefully, and carefully!

Hybrid operations (console)