Question

Step 1. Start Netbeans and create a project called ArrayLab

Step 2. Write the main method

 Declare and initialize an array called myNums int myNums = {3, 8, 12, 4, 2, 9, 6};  Declare an int called largestNum and set it to 0.

 Write a for loop that prints the array for (int index = 0; index < myNums.length; index++) { System.out.println(myNums[index] + “ “); }

 Write a for loop that prints the array backwards  Write a for loop that sums the array. Create a variable called total and set it to 0. Step through the array and add each element to total. Print the total when the loop finishes.

 Now write a second for loop that will step through the array again. This time, instead of printing each element, it will check to see if each element is greater than largestNum. If it is, then assign that element to largestNum largestNum = myNums[index];

 Write a for loop that finds the smallest number  Write a for loop that finds the average of the numbers.

 Write a method that searches the array for a number, returns true if found, false otherwise. Call that method, searching for 9. The call the method again, searching for 7. After each call, print if found or not.  Challenge: If you want an extra challenge, write code right after you declare largestNum that asks for the size of the array, initializes the array to that size and then uses a for loop to get the elements of the array from the user.  Save your program.  Compile and execute your program. Show the teacher the results.

Answer 1

public class ArraysTest {
   public static void main(String[] args) {
       int myNums[] = { 3, 8, 12, 4, 2, 9, 6 };
       int largestNum;

       for (int index = 0; index < myNums.length; index++) {
           System.out.println(myNums[index] + " ");
       }
       largestNum = -1;
       for (int index = 0; index < myNums.length; index++) {
           if (largestNum < myNums[index])
               largestNum = myNums[index];
       }
       int smallestNum = myNums[0];
       for (int index = 1; index < myNums.length; index++) {
           if (smallestNum > myNums[index])
               smallestNum = myNums[index];
       }
       double avg = 0;
       for (int index = 0; index < myNums.length; index++) {
           avg += myNums[index];
       }
       avg = avg / myNums.length;
       System.out.println("Largest: " + largestNum);
       System.out.println("Smallest: " + smallestNum);
       System.out.println("Average: " + avg);
       if (search(9, myNums))
           System.out.println("9 Found in the array");
       else
           System.out.println("9 Not found in the array");
       if (search(7, myNums))
           System.out.println("7 Found in the array");
       else
           System.out.println("7 Not found in the array");

   }

   public static boolean search(int ele, int arr[]) {
       for (int i = 0; i < arr.length; i++)
           if (arr[i] == ele)
               return true;
       return false;
   }
}