[rasmus]

Hello! I've been stuck on how to do: search for the lucky number 7. If the array contains the
number 7, the text “Lucky array” should be printed to the output and calculate the average of all values in the array. Here is my code

   import java.util.*;

public class Program2 
   {
       public static void main (String []arg)
      {
         Random generator=new Random();
      // this create a empty array named arr
         int [] arr = new int[10];
         
			String myLuckyNumber = "7"; 
			int sum;
         double medel;
      //a) this fills the array with value generated by the Random
         for(int i=0;i <arr.length;i++)
            arr[i]=generator.nextInt(100);
      // B)/> this prints the array
         for(int i=0;i <arr.length;i++)
            System.out.println(arr[i]);
      // c) calculate the sum of all values in the array
         sum = 0;
         for (int i=0; i<arr.length; i++)
         {
            sum += arr[i];
         }
      
         System.out.println("\nDen Totala summan är: " + sum);
      // d) calculate the average of all values in the array
         medel = 0;
         for (int i=0; i<arr.length; i++)
         {
            medel += arr[i];
            medel /= sum;
         }
         System.out.println("\nMedelvärdet är: " + medel/sum);
		
		 // e) search for the lucky number 7. If the array contains the
// number 7, the text “Lucky array” should be printed
// to the output.

      System.out.println("My lucky number is: " + myLuckyNumber); 

      } 
   
   }

This post has been edited by no2pencil: 24 February 2010 - 08:20 PM
Reason for edit:: Added code tags

[macosxnerd101]

Please,

To search, just iterate through your array using a for loop. Like so:

for(int i = 0; i < arrayName.length; i++){
   if(arrayName[i] == 7){
      ..do stuff..
   }
}

[pbl]

// d) calculate the average of all values in the array
medel = 0;
for (int i=0; i<arr.length; i++)
{
   medel += arr[i];
   medel /= sum;
}

Why looping through the array again ? What about
medel = sum / arr.length;

[Simple_Condolences]

He gave you the code.

int sum=0;
for(int i = 0;i<arr.length;i++)
sum+=arr[i];

int ave = sum/arr.length;

System.out.println("Your average is "+ave);

- Zach

[pbl]

rasmus07, on 25 February 2010 - 07:12 AM, said:

I don´t now pbl. It was the only time I got a mean value. What am I doing wrong?
I do not know how to calculate the average of an array

The average of an array is the sum of all its elements divided by the number of elements
And you have just calculated the sum a few lines before