C# string to int with complex structure

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Hi i m a new c# coder, i have problem in converting a string. Actually the string will be taken input from user. Lets put it directly here

C#

string input = "1+23+45+65+55+12";

I need to convert the above string to int, so that i get the result of it.

I tried

C#

Convert.ToInt32(input);

and

C#

int.Parse(input);

but not working, please help me out.

Posted 24-Nov-12 3:25am

Sachin Dan

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OriginalGriff · Accepted Answer · 2012-11-24T03:44:00

Solution 1

It won't - you need to evaluate it as an expression. Have a look at this: A Tiny Expression Evaluator[^] - it should help.

Posted 24-Nov-12 3:44am

OriginalGriff

CPallini · Accepted Answer · 2012-11-24T03:46:00

The methods you are using handle single numbers not expressions. For parsing expressions you need to build, precisely, a parser.
On the other hand, provided your expressions format is simple as the one in the example, you can build the parser very quickly, e.g.

C#

string expr = "1+23+45+65+55+12";

string[] num = expr.Split(new char[] { '+' });
int sum = 0;
foreach (var s in num)
{
  sum += int.Parse(s);
}
Console.WriteLine("sum =  {0}", sum);

Jitendra2005 · Accepted Answer · 2012-11-24T03:54:00

You can use below function:

C#

public static double Evaluate(string expression)
        {
            System.Data.DataTable table = new System.Data.DataTable();
            table.Columns.Add("expression", string.Empty.GetType(), expression);
            System.Data.DataRow row = table.NewRow();
            table.Rows.Add(row);
            return double.Parse((string)row["expression"]);
        }

Reference:
http://stackoverflow.com/questions/6052640/in-c-sharp-is-there-an-eval-function[^]

Thanks,
Jitendra

[edit]code block added[/edit]

C# string to int with complex structure

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