How to convert an integer to string in Java without use of any inbuilt function?

Question

I want to convert a string say "98989" into an integer without using any library functions in java. Give fastest way to do it and explain why your method is best.

Answer 1

Here is compiled program which return String of any integer.

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
    private static int number;
    private static String stringresult;
    public static void main (String[] args) throws java.lang.Exception
    {
    System.out.println("Int To String");
    number=7667868;
    stringresult=IntToString(number);
    System.out.println("Number is To String="+stringresult);

    }
    public static String IntToString(int number)
{
    int StringConvet = 48;

    int eachDigit = number;
    int afterDivide = number;
    String reVal = "";

    while(afterDivide >0)
    {
        eachDigit = afterDivide % 10;
        afterDivide = afterDivide / 10;
        if(eachDigit == 0)
        {
            reVal += "0";
        }
        else if(eachDigit == 1)
        {
            reVal += "1";
        }
        else if(eachDigit == 2)
        {
            reVal += "2";
        }
        else if(eachDigit == 3)
        {
            reVal += "3";
        }
        else if(eachDigit == 4)
        {
            reVal += "4";
        }
        else if(eachDigit == 5)
        {
            reVal += "5";
        }
        else if(eachDigit == 6)
        {
            reVal += "6";
        }
        else if(eachDigit == 7)
        {
            reVal += "7";
        }
        else if(eachDigit == 8)
        {
            reVal += "8";
        }
        else if(eachDigit == 9)
        {
            reVal += "9";
        }
    }
    String reVal2 = "";
    for(int index =  reVal.length() -1 ; index >= 0 ; index--)
    {
        reVal2 += reVal.charAt(index);
    }
    return reVal2;
}
}

Comments

here is the link of online successfully compiled code: https://ideone.com/GgRvoM