The document discusses three ways to manipulate array data: searching, accumulating, and reversing elements. It provides code examples to search an array for a value and return its index, add corresponding elements of two arrays into a third array, and read numbers into an array and print them in reverse order.

1. MANIPULATING ARRAY:
SEARCHING, ACCUMULATING
AND ELEMENT REVERSING
Chapter 7.2:

2. Manipulate data into arrays
 Searching a value
 Calculation
 Reverse element

3. Searching a value
 Eg.- A method to search an array of integer
 The Search method return the location of the first
array element equal to the search value
int Search (int[ ] num, int search value){
int location;
for (i=0; i =num.length; i++)
if(num[i] = = search Value)
location = i;
return location;
}

4.  Assume the num values as below:
int[] num = {10,20,30,40,50,60,70,80,90,100}
 If searchValue is 60, the method will
return 5 to Search method.
4
40
10
20
30
50
60
70
80
90
100
num[0]
num[1]
num[2]
num[3]
num[4]
num[5]
num[6]
num[7]
num[8]
num[9]
Location, i

5. Calculation in array
 Eg:- add a number from Array1 and Array2, and store
the total in Array3
 Assume Array1, Array2 and Array3
declarations as below:
int[ ] Array1 = {10,20,30,40,50,60,70,80,90,100};
int[ ] Array2 = {11,22,33,44,55,66,77,88,99,110};
int[ ] Array3 = new int[10];

6. +
10 21
42
63
84
:
:
:
:
:
:
11
20
30
40
50
60
70
80
90
100
22
33
44
55
66
77
88
99
110
Array[0]
Array[1]
Array[2]
Array[3]
Array[4]
Array[5]
Array[6]
Array[7]
Array[8]
Array[9]
Array[0]
Array[1]
Array[2]
Array[3]
Array[4]
Array[5]
Array[6]
Array[7]
Array[8]
Array[9]
Array[0]
Array[1]
Array[2]
Array[3]
Array[4]
Array[5]
Array[6]
Array[7]
Array[8]
Array[9]

7. Contents
public static void ArraySum()
{
int[] Array1 = {10,20,30,40,50,60,70,80,90,100};
int[] Array2 = {11,22,33,44,55,66,77,88,99,110};
int[] Array3 = new int[10];
int i;
for (i=0; i < 10; i++)
{
Array3[i] = Array1[i] + Array2[i];
System.out.println("Array3["+i+"]=“
+Array3[i]);
}
}
Output
Array3[0] = 21
Array3[1] = 42
Array3[2] = 63
Array3[3] = 84
Array3[4] = 105
Array3[5] = 126
Array3[6] = 147
Array3[7] = 168
Array3[8] = 189
Array3[9] = 210

8. for (i=0; i < 10; i++)
Array3[i] = Array1[i] + Array2[i];
Values of Array3 during for loop iterations
i Array1[i] Array2[i] Array3[i]
0 10 11 21
1 20 22 42
2 30 33 63
3 40 44 84
4 50 55 105
5 60 66 126
6 70 77 147
7 80 88 168
8 90 99 189
9 100 110 210

9. Reverse element
Eg- Read 10 integer numbers, and print the
numbers in reverse order
public static void ReverseOrder()
{
int item[] = new int[10];
int i;
//Read integers number and store in item[i]
System.out.println("Enter ten integers number:");
for(i = 0; i < 10; i++)
item[i] = input.nextInt();
//Print the output in reverse order are:");
System.out.println("The numbers in reverse order are:");
for(i = 9; i >= 0; i--)
System.out.println(item[i]);
}

10. Output Enter ten integers number:
56
65
67
43
64
76
39
77
47
84
The numbers in reverse order are:
84
47
77
39
76
64
43
67
65
56