public class Kal0 public static void main String args int String numbe

public class Kal0{
  public static void main(String[] args){
    int x=0;
      String number="";
      String sign="";
        java.util.Vector plus=new java.util.Vector();
        java.util.Vector minus=new java.util.Vector();

          while
          {
            System.out.println("Enter a number");
            java.util.Scanner scan = new java.util.Scanner(System.in);
            number = String.valueOf(scan.next());

            System.out.println("Enter a math operation");
            java.util.Scanner scan2 = new java.util.Scanner(System.in);
            sign = String.valueOf(scan2.next());

           }

        
           

            double [] a=new double[n];
            String b[]=new String[n];


          for(int i=0; i<a.length; i++){
            if(b[i].equals("+"){x+=a[i];}
            if(b[i].equals("-"){x-=a[i];}

}