public class stf {

 public stf() {}


 public float getFloat(String str){

   float begin=0, end=0;
   boolean isPOINT=false;
   char c=' ';
   int begini=1, endi=1;


   for(int i = str.length()-1; i>=0; i--){

    c=str.charAt(i);

     if(c == '.' && !isPOINT){
      isPOINT = true;
      continue;
     }

     
     if(c >= '0' && c <= '9'){
       if(isPOINT){
         begin += (c-48)*begini;
         begini*=10;
       }
       else{
         end += (c-48)*endi;
         endi*=10;
       }
     }

     else{
      begin=0;
      end = 0;
      break;
     }
   }

   if(!isPOINT){
    begin=end;
    end=0;
   }

   begin += (end/endi);

   if(str.charAt(0) == '-')
    begin = -1*begin;

  return begin;
 }



 
}