| C++ Multi Dimensional Arrays | C++ Beginner Doubts | C++ Forum

C++ Forum C++ Beginner Doubts | C++ Multi Dimensional Arrays

C++ Multi Dimensional Arrays

Posted Date Unknown 0 Comment

It is a common observation that multi - dimensional array manipulation is always going to be a difficult for any beginner in C++. This article will guide you on some of the multi dimensional array aspects like initializing a one and two dimensional array, how to allocate memory in the heap for a 1 and two dimensional array using the new operator and how to free the dynamically allocated memory using the delete operator.

The youtube video tutorial and the accompanying source code will be guide you on how to play around with C++ Multidimensional arrays. Watch the video below and play around with the source code. Please post you questions if any in the feedback section of this article.

Also see the main source code snippet below from the VC++ 2005 solution workspace..

#include <stdio.h>
#include <string.h>

int main(int argc, char* argv[])
{
    printf("Muti Dimensional C++ Array Example... ");

    //Initializing a static one dimensional integer array..
    int StaticOneDimensionalArray[5]={1,2,3,4,5};

    printf("StaticOneDimensionalArray Results.. ");

    for(int i=0;i<5;i++)
    {
        printf("%d",StaticOneDimensionalArray[i]);
    }

    printf(" ");

    //Initializing a static two dimensional array..

    int StaticTwoDimensionalArray[2][5]={{1,2,3,4,5},{6,7,8,9,10}};

    //Another type of initialization..

    int StaticTwoDimensionalArrayEx[2][5]={1,2,3,4,5,6,7,8,9,10};

    printf("StaticTwoDimensionalArray Results.. ");

    for(int i=0;i<2;i++)
    {
        for(int j=0;j<5;j++)
        {
            printf("%d",StaticTwoDimensionalArray[i][j]);
        }
    }

    printf(" ");

    printf("StaticTwoDimensionalArrayEx Results.. ");

    for(int i=0;i<2;i++)
    {
        for(int j=0;j<5;j++)
        {
            printf("%d",StaticTwoDimensionalArrayEx[i][j]);
        }
    }
    printf(" ");

    //Initializing a dynamic 1 dimensional array..
    //Allocate memory dynamically
    int iSize=5;
    int* DynamicOneDimensionalArray= new int[iSize];

    //Initialize values
    for(int i=0;i<iSize;i++)
    {
        DynamicOneDimensionalArray[i]=i*2; //Multiply index by two as the initialized value
    }

    printf("DynamicOneDimensionalArray Results.. ");

    for(int i=0;i<iSize;i++)
    {
        printf("%d",DynamicOneDimensionalArray[i]);
    }

    printf(" ");

    //Initializing a dynamic 2 dimensional array..
    //Allocate memory dynamically
    int iNoOfRows=2;
    int iNoOfCols=5;
    int** DynamicTwoDimensionalArray= new int*[iNoOfRows]; //Create two rows

    //Now create 5 columns for each rows
    for(int i=0;i<iNoOfRows;i++)
    {
        DynamicTwoDimensionalArray[i]= new int[iNoOfCols];
    }

    for(int i=0;i<iNoOfRows;i++)
    {
        for(int j=0;j<iNoOfCols;j++)
        {
            DynamicTwoDimensionalArray[i][j]=i*j; //Initialize the values as i* j
        }
    }

    printf("DynamicTwoDimensionalArray Results.. ");

    for(int i=0;i<iNoOfRows;i++)
    {
        for(int j=0;j<iNoOfCols;j++)
        {
            printf("%d",DynamicTwoDimensionalArray[i][j]);
        }
    }

    printf(" ");

    //Delete the dynamic one dimesional array memory (memory allocated in the heap)

    delete [] DynamicOneDimensionalArray;
    DynamicOneDimensionalArray=NULL; //good Habbit to assign NULL pointer after use
    //delete the dynamic two dimensional array memory

    //Delete first the column memory
    for(int i=0;i<iNoOfRows;i++)
    {
        delete [] DynamicTwoDimensionalArray[i];
    }
    //Now delete the rows..
    delete [] DynamicTwoDimensionalArray;

    DynamicTwoDimensionalArray=NULL; //good Habbit to assign NULL pointer after use

    //Similarly for other types and user defined data types..
    //for example take the case of a user defined data type..

    class Person
    {
    public:

        char Name[20];
        int iAge;
        Person()
        {
            iAge=10;
        }
    };

    Person PersonStaticArray[10];
    Person* PersonDynamicArray= new Person[10];

    strcpy(PersonDynamicArray[0].Name,"Justin Thomas");
    PersonDynamicArray[0].iAge=30;

    printf("PersonDynamicArray First Index vales.. ");
    printf("First Persons Name and Age is:-> %s, %d ",PersonDynamicArray[0].Name,PersonDynamicArray[0].iAge);
    //Etc etc..

    //visit www.tektips.in for more details..

    return 0;

}

See All Responses Below...

Author

Message Rating

Author Name

Posted on:

Report Spam

Please Login to Post Your Comments

Name (Max. 100 characters)

Select Language

Comments

Attach File(Max. Size: 2 MB)

A few simple rules when posting your Comments,

Please post only answers relevant to the topic of discussion.
Please dont misuse this site or do not be abusive, offensive, inappropriate,harass anyone on the boards or post ads or spam. Doing so will delete your inappropriate messages and will block or delete your account on this site.

please solve this please a competition is going on

How to declare 2D array in managed C++

GrabCut function in opencv is too slow.Is there any way to increase its spped

error C2872: 'Exception' : ambiguous symbol

error LNK2019: unresolved external symbol

C++ Shared Library with Templates

How to creat visual studio 2012 c++ hello world

2 Dimensional Arrays in C++

Developing COM application using VC++ and ATL