Using arrays

[ncaver]

Create a file containing 20 exams scores ( ranging from 0-100 ). Write a program to read the file, calculate and output the average exam score to the screen. Use a 1 dimensional array to hold the exam scores.

I need help coming up with a program with this because this is my first time ever using arrays and it just does not make any sense to me at all. Please! Can someone help me ??

[48T7M4Gy]

What you do is create 20 exam scores and file them.

Hint: the array will need 20 elements and the average is the total of all the 20 divided by 20. Use floats because integer division will give you bad/misleading average.

arrays? Read this if your class notes and textbook fail:
http://www.cplusplus.com/doc/tutorial/arrays/

Come back with some code is best way to get more help:)

[ncaver]

When I put it in the Visio Studio its shows an error. accumulate is underlined ?

[doug4]

In the same way that you loop through the array to populate it, loop through it again to sum up the contents. Initialize a variable to 0 and add the contents of each array element to it.

Edit: This would be instead of using accumulate

[ncaver]

Okay so how would I get the average

would it be average = "exams.txt." / 20 ??

[mi41lumber]

I recommend:

#include <fstream>
#include <iostream>

int main()
{
  double aValue[20];
  double total = 0.0;

  std::ifstream ifs ("exams.txt", std::ifstream::in);

  for (int i (0) ; i < 20 ; ++i)
  {
      ifs >> aValue[i];
      total += aValue[i];
  }
  total /= 20.0;
  ifs.close();

  std::cout << total << std::endl;

  return 0;
}

[ncaver]

OMG !! thank you so much it displaced the average !