write a program in java to convert String to number without using library function.

class StringToNumber

{

       public static void main(String arg[])

       {

              String num="-12345";

              System.out.println(StrToNum(num));

       }

       public static int StrToNum(String str)

       {

              boolean isNegative=false;

              int number=0,i=0;

              if(str.charAt(0)=='-'){

                     isNegative=true;

                     i=1;

              }

              while(i<str.length())

              {

                     number*=10;

                     number+=(str.charAt(i++)-'0');

              }

              if(isNegative)

                     number=-number;

              return number;

       }

}

Output: