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public class ArrayExamp
{
static int n[] = { 43, 74, 92, 56, 57, 94, 87, 21, 76, 57, 39, 57, 68 };
public static void main(String args[])
{
for (int x = 0; x < n.length; x++)
System.out.print(n[x] + " ");
System.out.println();
System.out.println("Average is " + findAvg());
}
static public double findAvg()
{
int sum = 0;
for (int x = 0; x < n.length; x++) sum = sum + n[x];
return sum / n.length;
}
}
/* Run this program. Now write a method called findBig that will return
an integer with the highest number in the array.
Now add a method called findAs that will return how many scores were in the 80s.
(Difficult)Now see if you can write a method to find the score that is the most frequent (in this case 57). Call it findMode and it will return an integter.
MORE PRACTICE:
These are sample practice programs similar to the ones you will be asked to write on the test. They will use this template:
public class ArrayExamp
{
static int n[] = { 43, 74, 92, 56, 57, 94, 87, 21, 76, 57, 39, 57, 68 };
public static void main(String args[])
{
for (int x = 0; x < n.length; x++)
System.out.print(n[x] + " ");
System.out.println();
System.out.println("Average is " + findAvg());
}
static public double findAvg()
{
int sum = 0;
for (int x = 0; x < n.length; x++) sum = sum + n[x];
return sum / n.length;
}
}
You will be asked to write only a method similar to the findAvg method above. Use this template, however, to test your method. Change the values of the Array. You may use String arrays on some problems.
Write a method that returns:
- · the sum of all the values less than the average.
- · the value before the highest score (0 if the highest score is first) in the array
- · the avg of all numbers more than 10 below the high score
- · all scores that appear only once
- · the average of all the scores with the highest one excluded
- · the highest 2 scores
I will add more practice problems below. Some will involve passed in parameters, similar to the example below:
Write a method that passes in 2 integers and returns with the sum of all the numbers in the array that are between these two numbers. ( in this case, we are testing it with 50 and 80 )
public class ArrayExamp
{
static int n[] = { 43, 74, 92, 56, 57, 94, 87, 21, 76, 57, 39, 57, 68 };
public static void main(String args[])
{
for (int x = 0; x < n.length; x++)
System.out.print(n[x] + " ");
System.out.println();
System.out.println("Sum of nums between 50 and 80 = " + sumSpread(50,80));
}
static public int sumSpread(int low, int high)
{
int sum = 0;
for (int x = 0; x < n.length; x++)
{
if ( n[x] >= low )
if ( n[x] <= high )
sum = sum + n[x];
}
return sum;
}
}
import java.applet.Applet;
import java.awt.*;
public class ArrayInput extends Applet
{
TextField t1,t2;
Button b1;
String names[];
String scores[];
int acount;
public void init()
{
b1 = new Button("Enter");
t1 = new TextField(10);
t2 = new TextField(10);
add(b1);
add(t1);
add(t2);
names = new String[50];
scores = new String[50];
acount = 0;
}
public void paint(Graphics g)
{
for (int x=0;x<acount;x++)
{
g.drawString(names[x] + ",",x*25,100);
g.drawString(scores[x] + ",",x*25,120);
}
}
public boolean action(Event e,Object o)
{
if (e.target==b1)
{
names[acount] = t1.getText();
scores[acount] = t2.getText();
acount++;
}
t1.setText("");
t2.setText("");
repaint();
return true;
}
}
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