Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static double parseDouble(String s) throws NumberFormatException {
        boolean negative = (s.charAt(0) == '-'); // Check if negative symbol.
        double result = 0.0D; // Starting value
        int index = s.indexOf('.');

        if (index > -1) {
            // Means the decimal place exists, add values to right of it
            int divisor = 1;
            for (int i = index + 1; i < s.length(); i++) {
                divisor *= 10;
                int curVal = (s.charAt(i) - 48); // Convert char to int
                if (curVal > 9 | curVal < 0)
                    throw new NumberFormatException();
                result += ((double) curVal / divisor);
            }
        } else {
            index = s.length(); // If number string had no decimal
        }

        // Now add number characters to left of decimal
        int multiplier = 1;
        // TODO: Note: Sven removed a test here for no decimal place. Unsure if needed.
        // Check old version of SVN to see old line.
        int finish = negative ? 1 : 0; // Determine finishing position

        for (int i = index - 1; i >= finish; i--) {
            int curVal = (s.charAt(i) - 48); // Convert char to int
            if (curVal > 9 | curVal < 0)
                throw new NumberFormatException();
            result += (curVal * multiplier);
            multiplier *= 10;
        }

        return negative ? -result : result;
    }
}