According to my code, please provide a Tester that can prompt a user for input.

Question

According to my code, please provide a Tester that can prompt a user for input.

public class P6_2{
int count ;
double sum;
double sumSquares ;
  
public P6_2(){
this.count = 0;
this.sum = 0;
this.sumSquares = 0 ;
}
  
public void add (double num){
sum = sum +num;
sumSquares = sumSquares + num * num;
count ++;
}
  
public double getAverage(){
return sum / count;
}
  
public int getCount(){
return count;
}
  
public double getStandardDeviation(){
return Math.sqrt((sumSquares - Math.pow(sum,2)/count)/(count-1));
}
  

}

Explanation / Answer

public class P6_2{
int count ;
double sum;
double sumSquares ;

public P6_2(){
    this.count = 0;
    this.sum = 0;
    this.sumSquares = 0 ;
}
  
    public void add (double num){
      sum = sum +num;
      sumSquares = sumSquares + num * num;
      count ++;
    }
  
    public double getAverage(){
      return sum / count;
    }
  
    public int getCount(){
      return count;
    }
  
    public double getStandardDeviation(){
      return Math.sqrt((sumSquares - Math.pow(sum,2)/count)/(count-1));
    }
  

}
class Test
{
   public static void main (String[] args)
   {
       P6_2 obj = new P6_2(); //create object of class
      
       //add double numbers to obj
       obj.add(56.7);
       obj.add(34.5);
       obj.add(56.7);
       obj.add(34.5);
       obj.add(56.7);
       obj.add(34.5);
      
       //calculate average, count and standard deviation of numbers
       System.out.println("Average = "+obj.getAverage());
       System.out.println("Count = "+obj.getCount());
       System.out.println("Standard Deviation = "+obj.getStandardDeviation());
      
   }
}

Output:

Average = 45.6
Count = 6
Standard Deviation = 12.159440776614689

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