Is there anyway to name a variable using 2 variables?

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I want to have a new variable named after 2 other variables and I'm not sure how to do it in C#. The code below would create 5 variables named number1, number2, number3, number4, and number5 if it worked. The underlined int is where my visual studio says I'm receiving the error "Invalid expression term 'int'".

What I have tried:

int a = 1;
string number = "number";

for(int counter = 1; counter <=5; counter++)
{
    Console.Write("Please input a number: ");
    int (string.Concat(number,a)) = int.Parse(Console.ReadLine());
    a++;
}

Posted 16-Mar-18 6:13am

Member 13689794

Updated 17-Mar-18 9:55am

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5 solutions

Solution 2

Use an array or things like this if you know how many you want, or a List if you don't. Google "c# arrays" for examples\tutorials on how to use arrays.

Posted 16-Mar-18 6:22am

F-ES Sitecore

Solution 4

Quote:
Is there anyway to name a variable using 2 variables?

Not with C#.
What you want to do is the reason why arrays exist.

Posted 16-Mar-18 9:26am

Patrice T

Solution 5

Alternativelly to solution #1 by Thomas D [ProgramFOX][^] you can use a Dictionary[^], which enables you store the name of "variable" and its value. See:

C#

Dictionary<string, int> d = new Dictionary<string, int>();
for(int counter = 1; counter <=5; counter++)
{
    Console.WriteLine("Please input {0}. number: ", counter);
    int a = int.Parse(Console.ReadLine());
    d.Add("number" + counter, a);
}

Console.WriteLine();
foreach(var k in d.Keys)
{
	Console.WriteLine("Variable name: '{0}' | Value: {1}", k, d[k]);
}

Result:

Please input 1. number: 
Please input 2. number: 
Please input 3. number: 
Please input 4. number: 
Please input 5. number: 

Variable name: 'number1' | Value: 543
Variable name: 'number2' | Value: 34534
Variable name: 'number3' | Value: 67654
Variable name: 'number4' | Value: 22
Variable name: 'number5' | Value: 1

Posted 17-Mar-18 9:56am

Maciej Los

Solution 3

A quick google search on "C# adding number to string" reveals that all you have to do is use the '+' operator. string str = Console.ReadLine() + a;. It should be something like that, as I'm not yet proficient in C#.

Posted 16-Mar-18 6:22am

David O'Neil

Comments

Thomas Daniels 16-Mar-18 12:35pm

The question isn't about string/int concatenation though, it's about creating variables with dynamic names :)

Richard Deeming 16-Mar-18 12:41pm

The OP wants to create variables with dynamic names, not concatenate values to create a string.

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Thomas Daniels · Accepted Answer · 2018-03-16T06:21:00

Solution 1

No, you cannot dynamically create variables with a dynamic name.

It looks like you want to take 5 integers from input and store them. Have you considered using an array[^] (or a List<int>[^])?

Posted 16-Mar-18 6:21am

Thomas Daniels

Updated 16-Mar-18 6:22am

v2

Comments

Member 13689794 16-Mar-18 12:32pm

I wanted the possibility for infinite variables to be created. The example I provided only allows 5. But, say for instance, what if you want the user to tell you how many numbers they want to input?

Thomas Daniels 16-Mar-18 12:34pm

You can't dynamically create infinite variables but then again there isn't really a need for infinite variables as you can just store many elements in an array or List (I won't say "infinite" because practically, there are memory constraints).

If you use an array, you have to know the number of elements at the time of creation. Then indeed, you can ask the user how many elements they want to input.

If you cannot know the number of elements in advance, then go for a List (that's the second link I provided).

Maciej Los 17-Mar-18 15:35pm

5ed!