Q40: Put the following code in order to create a program that will declare and instantiate an array of 20 random values between 1 and 100 and then calculate and print the average of the first 10 numbers.
import java.util.*;
public class main{
public static void main (String[] args) {
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Random r = new Random();
int [] arr = new int[20];
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for (int i = 0; i<20; i++) {
arr[i] = r.nextInt(100) + 1;
System.out.println("arr["+i+"] is " + arr[i]);
}
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int sum = 0;
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for (int i = 0; i<10; i++) {
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sum += arr[i];
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}
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System.out.println("Avg of first 10 is " + sum/10.0);
---
}
}
2.
Q41: Put the following code in order to create a program that will declare and instantiate an array of 20 random values between 1 and 100 and then calculate and print the average of the last n numbers.
import java.util.*;
public class main{
public static void main (String[] args) {
---
Random r = new Random();
int [] arr = new int[20];
---
for (int i = 0; i<20; i++) {
arr[i] = r.nextInt(100) + 1;
System.out.println("arr["+i+"] is " + arr[i]);
}
---
int sum = 0;
---
for (int i = 20-n; i<20; i++) {
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sum += arr[i];
---
}
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if (n > 0)
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System.out.println("Avg of last n is " + (sum * 1.0)/n);
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else
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System.out.println("No numbers to average.")
---
}
}
