How can you cut a string into 3 parts?

Question

I have a TextBox where a user can enter a calculation, such as 100+200 on his keyboard.

How can I break the string into three parts, like:

string mySum = "200+800"; //Just and example of what he may enter into the textbox
int Operator = mySum.IndexOf('+');
string TheOperator = "+";
string part1 = (mySum.Substring(1, Operator - 1));
mySum.Remove(int.Parse(part1), Operator);
string part2 = (mySum);

//Calculate

int Answer = int.Parse(part1) + TheOperator + int.Parse(part2);
Messagebox.Show(Asnwer.toString()); //Message box should display 1000

Firstly I know this is wrong, but I am highly unsure how to do this. Ive looked everywhere but I can't find anything related directly to this

Do you really need to use "Split" function? or you can use any method to do the calculation? — User2012384, Mar 03 '15 at 06:43
A similiar question which discusses the generic options available. http://stackoverflow.com/questions/355062/is-there-a-string-math-evaluator-in-net — Parthasarathy, Mar 03 '15 at 06:47

score 2 · Answer 1 · answered Mar 03 '15 at 06:42

simple as this , make use of Split function

split by char

string[] words = s.Split('+', StringSplitOptions.RemoveEmptyEntries);

Split by char array , when there is more than one char

char[] delimiters = new char[] { '+', '*' };
    string[] parts = value.Split(delimiters,
                     StringSplitOptions.RemoveEmptyEntries);

you can also make use of regular expression like this

string value = "cat\r\ndog\r\nanimal\r\nperson";
    // Split the string on line breaks.
    // ... The return value from Split is a string array 
   string[] lines = Regex.Split(value, "\r\n");

Ian CT · Accepted Answer · 2015-03-03T06:49:43.480

2

You should use string.Split as follows:

// ...

var parts = mySum.Split('+');
var part1 = parts[0]; // 200
var operatorString = parts[1]; // +
var part2 = parts[2]; // 800

// ...

edited Mar 03 '15 at 06:49

answered Mar 03 '15 at 06:43

Ian CT

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This will actually produce the following - part1 = "2", operatorString = "0" part2 = "0". I can see you probably meant to use parts[0], parts[1] and parts[2] instead, but the split character is also not included in the output, so parts would only have 2 elements, not 3. – Paul McLean Mar 03 '15 at 06:49
@Aidan - i think i am fastest as per SO timing ...any ways....at lest you accepted answer....:) – Pranay Rana Mar 03 '15 at 11:40
@PranayRana Haha, I'm sorry. Im still very new with C# syntax, Ian Chu's answer looks the most simple and did what I wanted it to do. Although thanks for answering :) edit: If I had enough reputation, I would have upvoted your answer as well <3 – Aidan Mar 03 '15 at 11:54
Fastest answer doesn't always mean the best answer :) – Ian CT Mar 03 '15 at 13:49

score 1 · Answer 3 · edited May 23 '17 at 12:28

1

If you just want to do some simple calculation, try this

From Evaluating string "3*(4+2)" yield int 18:

using System.Data;

DataTable dt = new DataTable();
var v = dt.Compute("200+800","");

edited May 23 '17 at 12:28

Community

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answered Mar 03 '15 at 06:42

User2012384

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score 1 · Answer 4 · answered Mar 03 '15 at 06:45

split would work here.

using System;

public class Program
{
    public static void Main()
    {
        string mySum = "200+800";
        int totalSum = 0;
        foreach(var op in mySum.Split('+'))
        {
            totalSum += Convert.ToInt16(op);
        }
        Console.WriteLine(totalSum);
    }
}

here is fiddle.

score 1 · Answer 5 · answered Mar 03 '15 at 06:51

1

If you want only calculate you can do like this:

 var result = new System.Data.DataTable().Compute("200+800", null);
 Console.WriteLine(result);

Hope helps

answered Mar 03 '15 at 06:51

Jamaxack

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How can you cut a string into 3 parts?

5 Answers5