Common Array Algorithms

This chapter discusses how a for loop can be used to iterate over the elements of a one-dimensional array. In addition, it also discusses enhanced for loops. The chapter demonstrates the use of arrays to solve common problems such as finding sum, average, maximum, and minimum values of numbers stored in array. Pay attention to some of the common programming errors one can make while using arrays.

5. Complete Program



Answer:
The complete program is given below.







Complete Program



    

        

    

    

        
Notice that the two for statements are the same. This is very common. It would be nice to copy this program to a file and to run it. When you do this, change the length of the array (the 5) to some other value (say, 9) and note the effect.
Review: Recall that the scope of the identifier index declared in the for statement is limited to just the body of its loop. So in the program, there are two variables, each named index, and each limited in scope to the body of its own for.

    

    

        
            

            

            

                
                    
import java.util.Scanner ;

class InputArray
{

  public static void main ( String[] args )
  {

    int[] array = new int[5];
    int   data;

    Scanner scan = new Scanner( System.in );

    // input the data
    for ( int index=0; index < array.length; index++ )
    {
      System.out.println( "enter an integer: " );
      data = scan.nextInt();
      array[ index ] = data ;
    }
      
    // write out the data
    for ( int index=0; index < array.length; index++ )
    {
      System.out.println( "array[ " + index + " ] = " + array[ index ] );
    }

  }
} 

                		
            

        
    





    
Question 5:
The variable data is not really needed in this program. Mentally change the program so that this variable is not used.