Write a program to convert string to number without using Integer.parseInt() method.

Description:

Below example shows how to convert string format of a number to number without calling Integer.parseInt() method. We can do this by converting each character into ascii format and form the number.

Code:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 package com.govindsblog.algos;   public class MyStringToNumber {       public static int convert_String_To_Number(String numStr){                   char ch[] = numStr.toCharArray();         int sum = 0;         //get ascii value for zero         int zeroAscii = (int)'0';         for(char c:ch){             int tmpAscii = (int)c;             sum = (sum*10)+(tmpAscii-zeroAscii);         }         return sum;     }           public static void main(String a[]){                   System.out.println("\"3256\" == "+convert_String_To_Number("3256"));         System.out.println("\"76289\" == "+convert_String_To_Number("76289"));         System.out.println("\"90087\" == "+convert_String_To_Number("90087"));     } }

Output:

"3256" == 3256 "76289" == 76289 "90087" == 90087