csharp How to eficiently input 2 separate numbers in 1 line in C#

[Vuk]

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[minibois]

1 minute ago, Vuk said:

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How to eficiently input 2 separate numbers in 1 line in C#

Do you mean by 'input', 'have the user input something'? Or do you mean initialize a variable?

[Eigenvektor]

Could you define "efficient" a bit more? Efficient in terms of speed entering that number(s) or processing the input?

[Vuk]

14 minutes ago, Eigenvektor said:

Could you define "efficient" a bit more? Efficient in terms of speed entering that number(s) or processing the input?

Efficient in the means of not getting a WriteLine string then doing s[0] and s[1] for 2 char numbers and then parsing them...

[Vuk]

16 minutes ago, minibois said:

Title:

Do you mean by 'input', 'have the user input something'? Or do you mean initialize a variable?

User input in console

[Vuk]

3 minutes ago, Vuk said:

Efficient in the means of not getting a WriteLine string then doing s[0] and s[1] for 2 char numbers and then parsing them...

Actually s[0] and s[2] sorry. And oof you'd need to convert the gotten chars to strings and then to int bc int.Parse don't work with chars for some reason.

[Eigenvektor]

13 minutes ago, Vuk said:

Actually s[0] and s[2] sorry. And oof you'd need to convert the gotten chars to strings and then to int bc int.Parse don't work with chars for some reason.

You'll want to read a string, split it (eg on space) and then parse both strings into a number.

 

I would worry more about making that convenient for the user rather than efficient. Unless you're parsing thousands of numbers you don't need to worry about speed.

 

~edit: By thousands of numbers I mean from a source other than user input. A user will take far more time typing than the computer spends processing the input.

[straight_stewie]

12 hours ago, Vuk said:

How to eficiently input 2 separate numbers in 1 line in C#.

User input in console

So you've begun to brush up against lexical analysis.

The first step is to define a language that the user will use to input multiple numbers, say:

<UserNumber> := <number> <delimiter> <UserNumber> | <number> <delimiter> <number>;
	<number> := [0-9,]+;
    <delimiter> := " ";

Then, reading this language description gives you all the information you need to know how to extract an n length list of numbers from a user string:

First, we read in the user string. With this simple a definition, any string that only contains characters in the set {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ',', \s} and has no substrings "\s,\s" is a valid <UserNumber>.

We then split the string at the '\s' character, and remove any empty strings that return.

We then remove all of the commas from the remaining strings in the collection.

We then convert the collection of strings into a collection of ints by calling Convert.ToInt32(string s) on all of the strings in the collection.

That's just one possible way to do it, but on the lines of a good one. Thinking about user input as a language gives you the ability to systematically derive systems that can understand user input, yielding better and more maintainable code. It also gives you the ability to handle erroneous input gracefully instead of failing or entering into areas of undefined behavior.