Managing Multi-Dimensional Array in C++

Abour Multi-Dimensional Array:
In C++, you can model two-dimensional arrays, but you are not restricted to just two dimensions. Depending on your need and the nature of the application, you can model multidimensional arrays in memory

Declaring and Initializing Multidimensional Arrays
Syntax:
int Arr [2][3];
int Arr [2][3] = {{0, 1, 2}, {3, 4, 5}};
int Arr[3][3] = {{154, 219, 362}, {101, 248, 417}, {921,675, 811}};

Accessing Elements in a Multidimensional Array
#include <iostream>
using namespace std;
int main(){
   int Arr[3][3] = {{154, 219, 362}, {101, 248, 417}, {921,675, 811}};
   cout << “row 0: “ << Arr[0][0] << “ “<< Arr[0][1] << “ “<< Arr[0][2] << endl;
   cout << “row 1: “ << Arr[1][0] << “ “<< Arr[1][1] << “ “<< Arr[1][2] << endl;
   cout << “row 2: “ << Arr[2][0] << “ “<< Arr[2][1] << “ “<< Arr[2][2] << endl;
   getch();
   return 0;
}
Example

#include<iostream>

#include<math.h>

int arr[5][5],n;

// input matrix

void Input(){

        cout<<"\n Input the number element of matrix:\n";

        do{

               cout<<"\n n= "; cin>>n;

               if(n<2||n>5)  cout<<"\n Input n again ";

        } while (n<2||n>5);

        // Input matrix

        cout<<"\n Input matrix:\n";

        for(int i=0;i<n;i++)

               for(int j=0;j<n;j++){

                   cout<<"\n arr["<<i<<"]["<<j<<"]="; cin>>arr[i][j]; 

               }

}

// Print matrix

void Print(){

        cout<<"\n Matrix:\n";

        for(int i=0;i<n;i++){

                for(int j=0;j<n;j++)

               cout<<arr[i][j]<<"\t";

                cout<<"\n";

         }

}

//main function

int main(){        

        Input();

        Print();

        getch();

        return 0;

}

Managing One-Dimensional Array in C++

What is an Array:
An array is “a group of elements forming a complete unit
The following are characteristics of an array:
- An array is a collection of elements.
- All elements contained in an array are of the same kind.

- This collection forms a complete set.

Declaring and Initializing static arrays
Syntax:
element-type array-name [number of elements] = {optional initial values}
Example:
int MyNumber[] ={1,2,3,4,5}
int MyNumber[4] = {32, 87, 120, 247};
int MyNumber[4] = {0}; // initialize all integers to 0

Accessing data stored in an Array
#include <iostream>
using namespace std;
int main (){
    int Arr[4] = {32, 87, 120, 247};
    cout << “First element at index 0: “ << Arr[0] << endl;        //32
    cout << “Second element at index 1: “ << Arr[1] << endl;  //87
    cout << “Third element at index 2: “ << Arr[2] << endl;      //120
    cout << “Fourth element at index 3: “ << Arr[3] << endl;    //247
    return 0;

}

Modifying Data Stored in an Array
#include <iostream>
using namespace std;
int main(){
    const int length = 4;
    int Arr [length] = {0};
    cout << “Enter index of the element to be changed: “;
    int nElementIndex = 0;
    cin >> nElementIndex;
    cout << “Enter new value: “;
    cin >> Arr [nElementIndex];
    cout << “First element at index 0: “ << Arr [0] << endl;
    cout << “Second element at index 1: “ << Arr [1] << endl;
    cout << “Third element at index 2: “ << Arr [2] << endl;
    cout << “Fourth element at index 3: “ << Arr [3] << endl;
    return 0;

}
Example:

#include<iostream> 

int main(){

        int a[100],n;
// Input n
        do{ 

              cout<<"\n n= "; cin>>n; 
              if(n<1||n>100)   cout<<"\n Input n again !";
        }while (n<1||n>100);
 // input array

        for (int i=0; i<n;i++){

               cout<<"\n a["<<i<<"]= "; 
               cin>>a[i];  

        }

// Print array

        cout<<"\n Print values of array: ";
        for (i=0;i<n;i++)
               cout<<a[i]<<", ";

         getch();

         return 0;

}