?
Solved

double array

Posted on 1998-07-03
1
Medium Priority
?
226 Views
Last Modified: 2010-08-05
Hi

I have problems passing a double array to a function.
I wrote two examples.
One involves a simple array. It works.
The second involves a double array.Id doesn.t.


First example

#include<stdio.h>
#include<iostream.h>

void printArray(int*);

int theArray[8];
int anotherArray[8];

void printArray(int* givenArray)
{
      for(int i = 0; i < 8; i++)
      {
            cout << givenArray[i] << endl;
      }
}


int main()
{

      for(int i = 0; i < 8; i++)
      {
            theArray[i] = i;
            anotherArray[i] = 10 + i;
      }

      printArray(theArray);
      cout << endl;
      printArray(anotherArray);

      return 0;
}


Second example:
#include<iostream.h>


void printArray(int**);



int theArray[8][8];
int anotherArray[8][8];

void printArray(int** givenArray)
{
      for(int i = 0; i < 8; i++)

            for(int j = 0; j < 8; j++)

                  cout << givenArray[j][i] << endl;

}

int main()
{
     for(int i = 0; i < 8; i++)
     {
      for(int j = 0; j < 8; j++)

             {
                  theArray[j][i] = i;
                  anotherArray[j][i] = j;
            }
     }



     printArray(theArray);
     cout << endl;
     printArray(anotherArray);

     return 0;
}


The error message that I get is"can not convert int[8]*
to **".

I understand that in the case of a single array,
theArray is equivalent to *theArray[0];

A pointer to the first member of the array.
I think that in case of a double array, we deal with a pointer to the first element of the array wich is an array itself that means is a pointer to the first element of the array.
So in case of a double array we deal with a pointer to a pointer.
When I passed the simple array to the function it was ok, because the function was defined as receiving a pointer to an integer and theArray was a pointer to an integer.

The second time, the function is defined as receiving a pointer to a pointer to an integer. theArray is a pointer to a pointer to a integer, still the program complains.

Thank you.
0
Comment
Question by:simi
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 1

Accepted Solution

by:
alex_r earned 200 total points
ID: 1167134
When you are dealing with double array[x][y], it's like you are dealing with array[x*y]
(It's wha's the complier do: "converts" array[2][3] to array[2 * y + 3])
So you must "to give" to compiler the "y"

So. you must your define function like this:
void printArray(int givenArray[][8])
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question