Page 325 - ComputerScience_Class_11

In the above program, we are required to use 10 variables, as marks of 10 students. However, in a case where the
number of students are large, say 100 students or more, then taking variables for each student would not only be
cumbersome but also occupy large memory space. So, instead of having different variables, it would be ideal to apply
an array for this purpose. An array can also be declared like other variables using angle bracket [ ] after the array name.

Let us understand the use of an array with the following example.

Program 2 Write a program to reduce the lengthy code of the preceding program using the concept of
array.

1 import java.util.*;
2 class sum_avg
3 {
4 public static void main(String args[])
5 {
6 Scanner sc= new Scanner(System.in);
7 int ar[ ]=new int[5];
8 int i, s=0;
9 double avg;
10 for(i=0; i<5; i++)
11 {
12 System.out.print("Enter marks ");
13 ar[i]=sc.nextInt();
14 s=s+ar[i];
15 }
16 for(i=0; i<5; i++)
17 {
18 System.out.print(ar[i]+" , ");
19 }
20 avg=s/5.0;
21 System.out.print("\nTotal: " +s+" and Average: "+avg);
22 }
23 }

The output of the preceding program is as follows:

BlueJ: Terminal Window - Java
Options

Enter marks 45
Enter marks 65
Enter marks 98
Enter marks 74
Enter marks 95
45, 65, 98, 74, 95,
Total: 377 and Average: 75.4

Arrays 323