Chapter -13 Array || 2-D or Dimensional || Explain in Details
Learn 2-D Arrays with Example
Introduction 2-Dimensional or Multidimensional:
- Multidimensional Arrays can be defined in simple words as array of arrays. Data in multidimensional arrays are stored in tabular form (in row and Column major order).
- Multi-Dimensional arrays represent 2D, 3D.....arrays, which are combination of several earlier types of arrays.
- For Example 2D '[] [] 'arrays is combination of two or more 1D arrays.
- Similarly 3D '[] [] []', arrays is a combination of two or more 2D arrays.
- A two dimensional arrays represents several rows and columns of data.
- For Example, the marks obtained by a group of students in five different subjects can be represented by a 2-D arrays.
- If we write the marks of three student as.
50,60,55,67,70
62,65,70,47,85
75,87,98,78,45
The preceding marks represent a 2D arrays since it got 3 rows(no. of students) and in each row 5 columns(no. of subjects). There are totally 3*5= 15 elements .We can take the first rows itself as a 1D arrays. Similarly the second rows is a 1D and the third rows is another 1D arrays. Hence the preceding 2D arrays three 1D arrays within it.
We can declared a 2D arrays:
int marks[] [] = { {50,60,55,67,70}, {62,65,70,47,85}, {75,87,98,78,45} };
So We can Say that 2-D or Multi-D arrays are same, here now discussed on most important points.
Multi- Dimensional Arrays:
- It is collection of data of same datatype.
- It is used to store group of data simultaneously.
- It can store data of same data type means an integer array can store only integer value, character arrays can store only character value used so on.
- We can’t fetch data from array directly therefore we use index point.
- The index of arrays always start with 0.
- Index value is always an integer number.
- Arrays may be of any data type like int, char, float, etc.
Syntax: 2-D Arrays Diagram
·
Here Now:
- · Arr is the name of arrays.
- · int is the data type of array.
- · Size of arrays is 3*3 means we can store maximum 9 values in this arrays.
- So this is called 3D arrays .
Step 1 Declaration- Syntax:
datatype array_name[row_index][column_index] = value;
Step 1 Initialization -Syntax:
int arr[] []= {{
45,89,65},{49,36,74}, {96,54,47)};
Step 2 Initialization -Syntax:
datatype array_name[row_index][column_index] = new datatype array_name[row_index][column_index] ;
int arr[] []= new int arr[3][3];
arr[0] [0]= 45;
arr[0] [1]= 89;
arr[0] [2]=65;
arr[1] [0]=49;
arr[1] [1]=36;
arr[1] [2]=74;
arr[2] [0]=96;
arr[2] [1]=54;
arr[2] [2]=47;
2- D Arrays Example :-
Example 1: Print all element using step 1:
class Arr2D{
public static void main(String arg[]){
int arr[] []= {{ 45,89,65},{49,36,74}, {96,54,47}};
System.out.println("value of arr[0][0]: " +arr[0][0]);
System.out.println("value of arr[0][1]: " +arr[0][1]);
System.out.println("value of arr[0][2]: " +arr[0][2]);
System.out.println("value of arr[1][0]: " +arr[1][0]);
System.out.println("value of arr[1][1]: " +arr[1][1]);
System.out.println("value of arr[1][2]: " +arr[1][2]);
System.out.println("value of arr[2][0]: " +arr[2][0]);
System.out.println("value of arr[2][1]: " +arr[2][1]);
System.out.println("value of arr[2][2]: " +arr[2][2]);
}
}
!!!!!!! Output !!!!!
value of arr[0][0]: 45
value of arr[0][1]: 89
value of arr[0][2]: 65
value of arr[1][0]: 49
value of arr[1][1]: 36
value of arr[1][2]: 74
value of arr[2][0]: 96
value of arr[2][1]: 54
value of arr[2][2]: 47
Example 1.1 Print all elements using loop throw.
class Arr2D1{
public static void main(String arg[]){
int arr[][]= {{ 45,89,65},{49,36,74}, {96,54,47}};
for(int i=0; i<=2; i++){
for(int j=0; j<=2; j++){
System.out.println("Value of arr["+i+"] ["+j+"]="+arr[i][j]); // for new line
System.out.print("Value of arr["+i+"] ["+j+"]="+arr[i][j]);
}
}
}
}
!!!!!!! Output !!!!!
Value of arr[0] [0]=45
Value of arr[0] [1]=89
Value of arr[0] [2]=65
Value of arr[1] [0]=49
Value of arr[1] [1]=36
Value of arr[1] [2]=74
Value of arr[2] [0]=96
Value of arr[2] [1]=54
Value of arr[2] [2]=47
Example 1.2 print Question in tabular format.
class Arr2D2{
public static void main(String arg[]){
int arr[][]= {{ 45,89,65},{49,36,74}, {96,54,47}};
for(int i=0; i<=2; i++){
for(int j=0; j<=2; j++){
System.out.print(arr[i][j]+" ");
}
System.out.println(" ");
}
}
}
!!!!!!! Output !!!!!
45 89 65
49 36 74
96 54 47
Example 1.3 print Question in tabular format 2*3.
class Arr2D3{
public static void main(String arg[]){
int arr[][]= {{ 45,89,65},{49,36,89}};
for(int i=0; i<2; i++){
for(int j=0; j<=2; j++){
System.out.print(arr[i][j]+" ");
}
System.out.println(" ");
}
}
}
!!!!!!! Output !!!!!
45 89 65
49 36 89
Example 1.4 : Print Question in tabular from but Input value by User.
import java.util.Scanner;
class Arr2D4{
public static void main(String arg[]){
Scanner sc= new Scanner (System.in);
int ar[][]= new int [3] [5];
System.out.println("Enter 15 value one by one:");
// taking input by user
int i, j;
for(i=0; i<3; i++)
for( j=0; j<5; j++)
ar[i][j]= sc.nextInt();
// printing element of array
System.out.println("All Given Element is ");
for(i=0; i<3; i++){
for(j=0; j<5; j++){
System.out.print(ar[i][j]+" ");
}
System.out.println(" ");
}
}
}
!!!!!!! Output !!!!!
Enter 15 value one by one:
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
All Given Value is:-
10 11 12 13 14
15 16 17 18 19
20 21 22 23 24
So Guys I hope all example is useful for your practice. Plz Don't forget follow me.
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