Java Number Round round(String num, int length)

Description

round

License

Apache License

Declaration

private static String round(String num, int length) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    private static String round(String num, int length) {
        // Helper function for realToString.
        // Round off num to the given field width
        if (num.indexOf('.') < 0)
            return num;
        if (num.length() <= length)
            return num;
        if (num.charAt(length) >= '5' && num.charAt(length) != '.') {
            char[] temp = new char[length + 1];
            int ct = length;
            boolean rounding = true;
            for (int i = length - 1; i >= 0; i--) {
                temp[ct] = num.charAt(i);
                if (rounding && temp[ct] != '.') {
                    if (temp[ct] < '9') {
                        temp[ct]++;// w  w  w  .  ja  va 2  s . c o  m
                        rounding = false;
                    } else
                        temp[ct] = '0';
                }
                ct--;
            }
            if (rounding) {
                temp[ct] = '1';
                ct--;
            }
            // ct is -1 or 0
            return new String(temp, ct + 1, length - ct);
        } else
            return num.substring(0, length);
    }
}

Related

1. round(int top, int div2, int divisor)
2. round(int x, int quantum)
3. round(Integer a)
4. round(Number number, Number unit)
5. Round(Object in)
6. round4(int n)
7. round_pow2(int x)
8. round_up(int value, int multiple)
9. roundAdd(double a, double b)