Thread: Exercise 147

So here is the deal:

The program below is intended to find the arithmetic mean of the numbers stored in the array q in two ways: once by storing the numbers in an ArrayList d, where you allow all the necessary conversions to be performed automatically; and once by storing them in an ArrayList e, where you perform all the conversions by hand. Complete the program.

Here is what I have so far:

 
 double[] q = { 0.5, 2.4, 7.4, 2.8, -6.2 };
    ArrayList<Double> d = new ArrayList<Double>();
    ArrayList<Double> e = new ArrayList<Double>();
 
    for ( double x : q )
    {
      d.add( x );
      e.add ( new Double ( x ) );
    }
 
    double dTotal = 0.0,
           eTotal = 0.0;
 
    for (double c : d)
    {
        double a += c; 
    }
 
    for (double f : e)
    {
        double b += f;
    }
 
return (dTotal / d.length);
return (eTotal / e.length);

--- Update ---

I switched it a little bit. It still gives me the same error:

for (double c : d)
 
{
 
    dTotal += c; 
 
}
 
 
 
for (double f : e)
 
{
 
    double eTotal += f;
 
}
 
 
 
System.out.print(dTotal / d.size());
 
System.out.print(eTotal / e.size());

--- Update ---

Why does it still show "a / d.size?" I thought I fixed that. Whatever, it's supposed to be "dTotal / d.size()", etc.