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how to convert a numerical string to an integer value without using any in-built conversion functions in c# or java?

Posted on 2010-08-18
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Last Modified: 2013-12-14
I have a numerical string variable as:
string in="4266";

Now, I want to convert this to an integer value as 4266, without using any in-built conversion functions such as: int.Parse().
I just want it to be solved by using the mathematical operators such as Division, Remainder..

Thanks.
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Question by:malakheti
3 Comments
 
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Expert Comment

by:Scanman999
ID: 33469101
Euh... how can you make a division/remainder operation on a string ?
You need to convert it to a numerical value first... which is exactly your question .... have I missed something ?

I haven't done any C# for many years but isn't there a CINT() or VAL() kind of function to do that ?

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LVL 85

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 33469796
Does this qualify as a "solution"?

*Assuming only positive, whole integer values:
        private void button1_Click(object sender, EventArgs e)

        {

            string input="4266";

            int output = StringToInt(input);

            MessageBox.Show(input + " <== ? ==> " + output.ToString());

        }



        private int StringToInt(string input)

        {

            string digit;

            int curValue;

            int value = 0;

            for (int i = 0; i < input.Length; i++)

            {

                digit = input.Substring(input.Length - (i + 1), 1);

                curValue = "0123456789".IndexOf(digit);

                value = value + (curValue * (int)Math.Pow(10, i));

            }

            return value;

        }

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Author Closing Comment

by:malakheti
ID: 33470284
Thanks.
This is what I wanted.
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