c# - Overload Method Error with Switch statement -

the application shall perform selected menu math operation on 2 entered numbers , display answer.you must use methods each math operation , decision must used pick method should executed. application shall display error message when correct menu number not entered. decision 1-5 valid selections , else “invalid”. application shall not allow division zero. not perform divide operation if second number variable zero, instead display error message.

i have written code program showing following error: 1. no overload method addnumber takes 0 arguments. error showing math operation methods inside switch statements. 2. dividenumber method - not code paths return value

class program {     static void main(string[] args)     {          double  n1 = convert.todouble(console.readline());         //string n2 = "";        double n2 = convert.todouble(console.readline());          console.clear();         console.writeline("simple calculator");         console.writeline("\t 1) add");         console.writeline("\t 2) subtract");         console.writeline("\t 3) multiply");         console.writeline("\t 4) divide");         console.writeline("\t 5) quit");         console.write("enter selection: ");          int menuselection =0;       //  double total;            //  menuselection = console.readline();             switch (menuselection)             {                 case 1:                    // total = convert.toint32(addnumbers("results:"));                    console.writeline(addnumbers(n1,n2));                     break;                 case 2:                     console.writeline(subtractnumber(n1,n2));                     break;                 case 3:                     console.writeline(multiplynumber(n1,n2));                     break;                 case 4:                     console.writeline(dividenumber(n1,n2));                     break;                 case 5:                     break;                             default:                     console.writeline("invalid selection !");                     console.readline();                     return;             }           //ask user enter 2 numbers         console.writeline();         console.write("enter number 1:", n1);       //  number1 = console.readline();         console.write("enter number 2:", n2);       //  number2 = console.readline();      }     public static double addnumbers(double number1, double number2)     {         return number1 + number2;     }      public static double subtractnumber(double number1, double number2)     {         return number1 - number2;     }      public static double multiplynumber(double number1, double number2)     {         return number1 * number2;     }      public static double dividenumber(double number1, double number2)     {         if (number1 == 0 && number2 == 0)         {             console.writeline("cannot divide zero.    try again");             return 0;         }         else         {             return number1 / number2;         }     } 

1st mistake taking input after calling switch cases

2nd mistake function have 2 parameters pass them.

like dividenumber(number1,number2) in switch case

hope understand

one thing notice taking input in string , function takes double parameters need convert string double.

give idea use double take input double n1 = convert.todouble(console.readline()); input console string.