programming-examples/java/Basics/Program to convert string to number without using Integer.parseInt() method (Java).java

/*
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.
*/

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"));
    }
}