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I am making a little code, and I am now already running into a error

string getCode(string code)
{
    int count = code.Length;
    if (count % 2 == 0)
    {
        string error = "no";
    }
    else
    {
        string error = "yes";
        string error_message = "There is something wrong with the code. Program.cs - line 23";
    }

    if (error == "yes")
        return null;

    return error;
}

Well, now I am setting the variable error in a if statement. Bu if I later say if (error == "yes") doesn't work. It gives me the error the name 'error' does not exist in the current content I am now already search whole the internet for 15-20 minutes. Tryin a lot of fixes and examples. With global variables and even tried to make another class for my variables and read the variables from there. That worked, but then I could not set the variables anymore. Or I just don't know how to do so. Can you please help me? I will be really thankful!

Thanks

You should declare the error variable out of the scope of if, like below:

string error = null;
if (count % 2 == 0)
{
    error = "no";
}
else
{
    error = "yes";
    string error_message = "There is something wrong with the code. Program.cs - line 23";
}

if (error == "yes")
    return null;

Doing so, you could access this variable either in the block of if or in the block of else or more generally speaking in all scopes that would be enclosed in the scope of method getCode.

side note: error_message can only be used in the block of else, and there you just declare a variable and you assign a value to it. You probably have to move also this declaration next to the declaration of error.

Reuse the Same Variable with Different Properties, Reuse a variable with different properties when the code generator can determine the For example, the following function example1 first uses the variable t in an if statement, where it Create a MATLAB file example1.m containing the following code. The block outputs of a MATLAB Function block in a Simulink® model. Students begin the lesson with a very basic description of the purpose of a variable. Students then complete a level progression that reinforces the model of a variable as a way to label or name a number. Students use variables to save a random number to see that variables actually store or save their values,

You have to declare the variables out of the scope to be accessible by the whole code, like

string error="";
string getCode(string code)
            {
                int count = code.Length;
                if (count % 2 == 0)
                {
                    error = "no";
                }
                else
                {
                    error = "yes";
                    string error_message = "There is something wrong with the code. Program.cs - line 23";
                }

                if (error == "yes")
                return null;
            } 

What is a variable in computer programming?, In computer programming, variables are used to store information to be referenced Let's say we have a file called scope.rb . We'll modify the same piece of code. When we use each , times and other method invocations, followed by {} or  When the server parses your main php code, it looks for any include ()s and merges the content of those files in, in that position. So variables that are present in the line before the include () retain their value, as long as variable scope allows it, throughout the included / merged code.

You could make the variable global by creating a class and then calling the class when needing to use this to do this create a class like below:

public static class Globals
{
    public static String error = "yes"; 
}

you can add anymore variables to that when needed to call it use

global.error

4. Code Reuse: Functions and Modules, Take a collection of functions and package them as a file, and you've got a module Python uses the name “function” to describe a reusable chunk of code. multiple lines (other programming languages use the name “heredoc” for the same concept). This argument name then becomes a variable in the function's suite. A variable's scope determines where in a program a variable is available for use. A variable's scope is defined by where the variable is initialized or created. In Ruby, variable scope is defined by a block. A block is a piece of code following a method invocation, usually delimited by either curly braces {} or do/end.

Change your code to:

string getCode(string code)
        {
            int count = code.Length;
            string error = "";
            if (count % 2 == 0)
            {
                error = "no";
            }
            else
            {
                error = "yes";
                string error_message = "There is something wrong with the code. Program.cs - line 23";
            }

            if (error == "yes")
            return null;
        }

What you need to know is that if you declare a variable inside a scope, it is visible inside that scope only. Curly braces define a scope so your error variables were visible inside your if true branch and else branch being two different variables with same name in different scopes.

The changed code moved error variable declaration into containing method scope (getCode) making it accessible.

Variable scope, Variables, declared with const , behave the same, so this article is about const We can use this to isolate a piece of code that does its own task, with A function is called “nested” when it is created inside another function. The standard *-Variable cmdlets aren't designed to work with environment variables. Environment variables are accessed using the env: drive prefix. For example, the %SystemRoot% variable in cmd.exe contains the operating system's root directory name.

        string getCode(string code)
        {
            int count = code.Length;
            string error = null;
            if (count % 2 == 0)
            {
                error = "no";
            }
            else
            {
                error = "yes";                    
            }

            if (error == "yes")
                return "something that you intended to return when there is an error";
            else
                return "something that you intended to return when there is no error";
        }

DCL01-C. Do not reuse variable names in subscopes, No other variable should share the name of a global variable if the other variable is in a A block should not declare a variable with the same name as a variable This noncompliant code example declares the msg identifier at file scope and  Generate a distribution file. Using Python at the command line, we’ll create a shareable distribution file to contain our module’s code. Install the distribution file. Again, using Python at the command line, install the distribution file (which includes our module) into site-packages.

Using Global Variables in Node.js, Global variables are very similar, if not identical, to regular variables. When you create a variable in a JavaScript file, that variables only exists in the In the code below, you can see an example of two different variables with different scopes. In the code block below, we create a global variable called globalString and  You can even place the piece of code into a variable and put the variable in parenthesis. (Note that EXEC allows the use of both regular character strings and Unicode character strings as input). Understanding the sp_executesql Stored Procedure. This is a great built-in stored procedure for SQL Server.

require_once - Manual, Then, attach this variable (that contains the path) to your included files. After this, if you copy paste your codes to another servers, it will still run, without You will notice the use of "\" as DIRECTORY_SEPARATOR, but the same result is  Variables allow for a lot of freedom in computer science. This lesson helps to explain what variables are and how we can use them in many different ways. Use this activity before (or in conjunction with) the lesson on abstraction to really hit the idea home.

Template Designer Documentation, Template variables are defined by the context dictionary passed to the template. This is important if an object has an item and attribute with the same name. With both trim_blocks and lstrip_blocks enabled, you can put block tags on their own If a string that you marked safe is passed through other Python code that  In this video you will learn how to write code for the first time and how to use variables in Arduino IDE.

Comments
  • C or C#? Those are two very different languages!
  • The scope of error needs to be before the if and the same level as the int count. Also this is not C so should not be tagged as such.
  • @Someprogrammerdude its c#
  • @Dragonthoughts Doesn't work..
  • The scope of a declared variable is limited to the enclosing braces { }. I.e. your codes declares 2 distinct error variables. One in if () { ... } and another in else { ...}. And there is no error variable in scope after if else.
  • This doesn't change anything, it only gives another error... See screenshot link
  • @20Host.nl When you declare a variable, you can't re-declare in any enclosing scope. In simple terms, when you declare the variable error in the body of getCode method, you can't re-declare it in the statements of an if block, or of a for block etc.
  • you have to assign a value to error from beginning, otherwise you'll get error: Use of unassigned local variable 'error'
  • I personally suggest you to read the following to improve your understanding of the scope of variables. devu.com/tutorials/cs-asp/articles/…
  • Now the if (error == "yes") doesn't give any error anymore. But the rest now does... See screenshot link
  • Read my code carefully. You have to remove the declaration from the whole code ! the rest will be just : error="Yes"; not string error = "Yes";
  • @20Host.nl: writing a type name (here string) before a variable name makes it a declaration.