error due to integer division in mean example

[Stephen Siegel]

The impl version of the mean example was getting the wrong answer. The bug is due to the following:

  while (i < N + 1) {
    j = ( (i-1) / i ) *j + a[i-1]/i;
    i = i + 1;
  }

The division (i-1)/i is integer division when what you want is real division. You need to do something like ((i-1)*1.0)/i. MiniMP caught the bug, which was kind of cool.

By the way, can some please change the name of variable j to something else. j is usually used for an integer variable. This is a real variable.

[Stephen Siegel]

I put in the 1.0 as suggested, and the test passed.