Adding Array Elements

Question

i'm attempting to learn C# and I have this code. I want it to display a random list of integers and then add them all together within the array and then display the average of all the numbers. Where have I gone wrong, can anyone help? Thanks.

using System;

class grades
{

    public static void Main(string[] args)
    {
        int sumValue = 0;
        int[] grades = new int [ 30 ];
        Random rnd = new Random();

    for (int i = 0; i < 30; i++)
        grades[i] = rnd.Next(1,101);

    foreach (int i in grades)
        {
        Console.WriteLine("{0}", i);
        sumValue = sumValue + i;
        }

    double average = sumValue/30;
    Console.WriteLine("{0}", average); 
    }
}

Well, what exactly behaves unexpectedly? can you be explicit? — Marc Gravell
– Marc Gravell, Commented Nov 25, 2014 at 12:02
Yeah, the random integers are displayed but the adding and the average isn't calculated. — user4291582
– user4291582, Commented Nov 25, 2014 at 12:04

Marc Gravell · Accepted Answer · 2014-11-25 12:06:24Z

5

Yeah, the random integers are displayed but the adding and the average isn't calculated.

Yes, it is; you can make it more obvious:

double average = sumValue / 30.0;
Console.WriteLine("The average is: {0:##0.0}", average);

Note also the .0 which ensures we aren't doing integer arithmetic (different fraction / rounding rules).

answered Nov 25, 2014 at 12:06

Marc Gravell

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1 Comment

user4291582 Over a year ago

Thank you. Just me being stupid and forgetting to make it stand out. Thanks.

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