Write a function to determine if a string is a number without using any built-in function.

Question

Rohit Krishnan · Accepted Answer

Why did you include the " if (number[0] == '.' || number[n - 1] == '.' || number[n - 1] == '-')". You could've just started at the for loop and it should work.

Raul Rivero · Answer

Here is my 15 mins C# solution after the interview:

public bool IsNumber(string number)
{
            int n = number.Length, dots = 0;
            if (number[0] == '.' || number[n - 1] == '.' || number[n - 1] == '-')
                return false;
            if ((number[0]  57) && number[0] != '-')
                return false;
            for (var i = 1; i  1)
                    return false;
                if (number[i]  57)
                {
                    if (number[i] == '.')
                    {
                        if (i == 1 && number[0] == '-')
                            return false;
                        else
                            dots++;
                    }
                    else
                        return false;
                }
            }
            return true;
}

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