intialise 2D arrays??

how do you intialise a 2D array?

int array[][] ??

how do we use a 2D array as a parameter in function?

void functionName(int array[][] , int numRows , int numCols)

or

void functionName(int array[numRows][numCols])

??

please help

This works fine:

Code:

---

#include <stdio.h>
#include <conio.h>

const int Width=5;
const int Height=8;

int MyArray[Width][Height]={0};

void Func(int Array[Width][Height])
{
  Array[0][0]=12345;
}

int main()
{
  Func(MyArray);
  printf("%d", MyArray[0][0]);
  getch();
}

---

const int Width=5;
const int Height=8;

int MyArray[Width][Height]={0};

so instead of defining the width and height ourselves

can we have user define it through scanf ?

Quote:

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Originally posted by Unregistered
so instead of defining the width and height ourselves

can we have user define it through scanf ?

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Yes, but not in this way. We must use dynamic allocation (new or malloc).

Sample (creates an int array with 10 elements):

Code:

---

int NrOfElements=10; //You can make the user input this number
int* Pointer;
Pointer = new int[NrOfElements]; //Allocate memory
if(Pointer!=NULL) //Check to see if allocation was successful
{
  //Do whatever you want here
  ...
  delete[] Pointer; //You must free the memory before you quit, memory leaks will occur otherwise
}

---

Quote:

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Originally posted by Magos

Yes, but not in this way. We must use dynamic allocation (new or malloc).

Sample (creates an int array with 10 elements):

Code:

---

int NrOfElements=10; //You can make the user input this number
int* Pointer;
Pointer = new int[NrOfElements]; //Allocate memory
if(Pointer!=NULL) //Check to see if allocation was successful
{
  //Do whatever you want here
  ...
  delete[] Pointer; //You must free the memory before you quit, memory leaks will occur otherwise
}

---

---

'new' and 'delete' are C++ keywords and they have no function in C. What you would want to do in C is this:

Code:

---

char **new2DCharArray( int x, int y )
{
    char **c = NULL;

    if( x > 0 && y > 0 ) c = malloc( x * y * sizeof( char ) );
    return c;
}

---

Quzah.

Quote:

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Originally posted by quzah


'new' and 'delete' are C++ keywords and they have no function in C. What you would want to do in C is this:
Quzah.

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Oops, this is the C forum, right :rolleyes:
My mistake... :cool: