C# function varibales

[MisterWhite]

Is there a way not to declare variables in another function?

Lets say we have this simple example

public static void Main (string[] args){  int m;  Function(m);  Console.Write(m);}public static void Function(int m)// this place{  m=2*3;}

Is there a special variable declaration method to that i would not need to rewrite variable names int function

[Nineshadow]

I don't quite get it...

[The Cool n00B]

This doesn't work because when Main runs the second function might not have. You need to declare the variable as a foo value to begin with. Also, why are you giving Function the variable m when m isn't created until it runs?

[Nuluvius]

Another point is that as soon as you pass m into that function it's going to be passed by value and not reference - which from the way you are attempting to assign to it looks to me like you think it will be a reference.

[MisterWhite]

I don't quite get it...

I want to use all variables from main without writing them in new functions header

public static void Function(int m)// what i want is without "int m"

[Nineshadow]

 

I want to use all variables from main without writing them in new functions header

public static void Function(int m)// what i want is without "int m"

Why use functions then?

It kinda defeats the purpose.

You could use global variables maybe.

 

 

Aaah. I get what you're trying to do.

Try

public static void Function(ref int m)

in the function declaration.

I think that's how references work in C#. In C++ it would be

int &m

[Nuluvius]

 

I want to use all variables from main without writing them in new functions header

public static void Function(int m)// what i want is without "int m"

 

Unless they are global to the scope then you can't. You could use a lambda and capture the variable implicitly but that's about as close as it gets.

[MisterWhite]

Unless they are global to the scope then you can't. You could use a lambda and capture the variable implicitly but that's about as close as it gets.

 

so it would be 

global int m;

?

[Nuluvius]

so it would be 

global int m;

?

 

No just declare it external to the scope of Main but within the same class.

[madknight3]

All non-static methods within the class can use this

public class Example{    private int someVariable;    // ...}

All static and non-static methds within the class can use this

public class Example{    private static int someVariable;    // ...}

Using public vs private vs protected will change what is allowed to access them.

[MisterWhite]

No just declare it external to the scope of Main but within the same class.

class MainClass{  string guess; public static void main()  {     guess="Like this?";// cause it doesn't work  }}

[Nineshadow]

Try this:

public static void Main (string[] args){  int m;  Function(m);  Console.Write(m);}public static void Function(ref int m){  m=2*3;}

[madknight3]

class MainClass{  string guess; public static void main()  {     guess="Like this?";// cause it doesn't work  }}

 

See my answer. The variable needs to be static as well.

[MisterWhite]

See my answer. The variable needs to be static as well.

i've tryed but got many errors, so ill stick with declaring all variables

[MisterWhite]

 

Try this:

public static void Main (string[] args){  int m;  Function(m);  Console.Write(m);}public static void Function(ref int m){  m=2*3;}

btw, when calling function in main, i had to add "ref" to the name also.

[MisterWhite]

some error occured

public static main(){string guess;string[] word= new string[40];int mistakes=0;int length;char[] empty = new char[50];int generate;allStuff(ref mistakes,ref length,ref empty,ref guess,ref generate,ref word);// ERROR  Use of unassigned local variable 'guess'}public static void allStuff(ref int mistakes, ref int length, ref char[] empty, ref string guess , ref int generate,ref string[] word){  // some stuff here}

[Nuluvius]

btw, when calling function in main, i had to add "ref" to the name also.

 

Yes you are quite right, the ref keyword will take the address of the variable. You won't need it for objects as those are passed by ref by default.

[MisterWhite]

Yes you are quite right, the ref keyword will take the address of the variable. You won't need it for objects as those are passed by ref by default.

any solution to earlier error?

[Nuluvius]

any solution to earlier error?

 

Well... what do you think? Consider the error message provided. Why not look up the ref keyword and the string class and have a think.

[MisterWhite]

Well... what do you think? Consider the error message provided. Why not look up the ref keyword and the string class and have a think.

even without those "ref" i get that message

[Nineshadow]

Guess is not initalized.

Try

string guess = "";

[MisterWhite]

 

Guess is not initalized.

Try

string guess = "";

Worked

[Nuluvius]

Guess is not initalized.

Try

string guess = "";

 

I was letting him work through things himself. In any event it's better to use the constant string.Empty.

[Nineshadow]

I was letting him work through things himself. In any event it's better to use the constant string.Empty.

We don't have that in C++ D:

[MisterWhite]

I was letting him work through things himself. In any event it's better to use the constant string.Empty.

i didn't have this error until i put all code in the function, so never thought it could be the case