C# Function Error -


this question has answer here:

as i'm new c# i'm trying make basic console based calculator. it's getting 1 error though. here code:

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks;  namespace functionbased_calculator {     class program     {         public void menu()         {             console.clear();             console.writeline("-=calculator=-\n");             console.writeline("(1.) addition");             console.writeline("(2.) subtraction");             console.writeline("(3.) multiplication");             console.writeline("(4.) division");             console.writeline("(5.) help");             string answer = console.readline();             if (answer == "1")             {                 addition();             }             else             {                 if (answer == "2")                 {                     subtraction();                 }                 else                 {                     if (answer == "3")                     {                         multiplication();                     }                     else                     {                         if (answer == "4")                         {                             division();                         }                         else                         {                             if (answer == "5")                             {                                 help();                             }                             else                             {                                 console.writeline("invalid");                                 console.readkey();                                 menu();                             }                         }                     }                 }             }         }         public void addition()         {             console.writeline("-=addition=-\n");             console.writeline("number 1:");             int num1 = convert.toint32(console.readline());             console.clear();             console.writeline("-=addition=-\n");             console.writeline("number 2:");             int num2 = convert.toint32(console.readline());             console.clear();             console.writeline("-=addition=-\n");             int sum = num1 + num2;             console.writeline(sum);             console.readkey();             menu();         }         public void subtraction()         {             console.writeline("-=subtraction=-\n");             console.writeline("number 1:");             int num1 = convert.toint32(console.readline());             console.clear();             console.writeline("-=subtraction=-\n");             console.writeline("number 2:");             int num2 = convert.toint32(console.readline());             console.clear();             console.writeline("-=subtraction=-\n");             int sum = num1 - num2;             console.writeline(sum);             console.readkey();             menu();         }         public void multiplication()         {             console.writeline("-=multiplication=-\n");             console.writeline("number 1:");             int num1 = convert.toint32(console.readline());             console.clear();             console.writeline("-=multiplication=-\n");             console.writeline("number 2:");             int num2 = convert.toint32(console.readline());             console.clear();             console.writeline("-=multiplication=-\n");             int sum = num1 * num2;             console.writeline(sum);             console.readkey();             menu();         }         public void division()         {             console.writeline("-=division=-\n");             console.writeline("number 1:");             int num1 = convert.toint32(console.readline());             console.clear();             console.writeline("-=division=-\n");             console.writeline("number 2:");             int num2 = convert.toint32(console.readline());             console.clear();             console.writeline("-=division=-\n");             int sum = num1 / num2;             console.writeline(sum);             console.readkey();             menu();         }         public void help()         {             console.writeline("-=help=-\n");             console.writeline("if got compiled don't need help.");             console.readkey();             menu();         }         static void main(string[] args)         {             menu();         }     } }

here error every time try run (i'm using vs express 2013) error:

an object reference required non-static field, method, or
property 'functionbased_calculator.program.menu()'

it's on line 133. think might have using menu() inside static void main. if me that'd great!

menu() needs declared static, along it's entire call hierarchy:

public static void menu()

the compiler leaves no room error. when accessing astatic method that's declared on type, not instance, need make sure field or method called static well.


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