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Guyz I have again got a problem with functions. "" Write a function to input matrices"" Or how can I input using fuctions ?? is it possble ??

so far I have developed a few lines.

//fuction to input a 2D-array.
int multi_array(int r , int c)//r is number fo rows and c is number of colums
  {
  int j=0,i=0,arr[r][c];
    for(i=0;i<r;i++)
      {
       for(j=0;j<c;j++)

plz help me asap.

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Last Post by atish00
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declare a 2 dim array.
inside the inner loop, as user for i/p and keep storing in each element of the array.

--post the code inside code tags

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as user for i/p ?? what does that mean

@"niek_e" = The array size is undefined/

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my problem is how do I input through a function.

can anyone gimme the specific code line.

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as user for i/p ?? what does that mean

He means 'ask user for input'

@"niek_e" = The array size is undefined/

Ok. How does the user input the data? Is there some sort of delimiter between numbers or...?? Please give your specific requirements.

You have a error in your code: int arr[r][c]; You can only do this if 'r' and 'c' are const int . If you want to create a array dynamicly you should look at new and delete (or malloc() and free())


Niek

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as user for i/p i meant 'ask' user for i/p

btw if matrix size is undefined at compile time then simple array will not work as you wont know the dimensions..

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I am posting the actual question

Write a menu driven program to execute the following functions:
* Function to input a matrix
*Function to display a matrix
*Function to find the product of two matrices.
*Function to return the sum of left diagonal of the matrix.

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I suppose we are to define it in the program not function.

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Great. So finally you answer my question if it has to by user-defined or not. This makes your life a lot easier, because dynamicly allocating 2-d arrays isn't really simple.

so now you can do something like this:

#include <iostream>


int main()
{
    const int ASIZE = 3;
    
    int matrix[ASIZE][ASIZE];
    
    for (int x =0; x < ASIZE; x++)
    {
        for (int y =0; y < ASIZE; y++)
        {
               // do stuff here
        }
    }

    return 0;   
}

Edited by Nick Evan: n/a

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thanx but can you please help me with the placement of

cin>>

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but that will mean that the user will have to edit the function every time.

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but that will mean that the user will have to edit the function every time.

What do you mean? Editing what function?

Here's what I meant:

#include <iostream>


int main()
{
    const int ASIZE = 3;
    
    int matrix[ASIZE][ASIZE];
    
    for (int x =0; x < ASIZE; x++)
    {
        for (int y =0; y < ASIZE; y++)
        {
            std::cout << "enter value for x,y = " << x << "," << y << std::endl;
            std::cin >> matrix[x][y];
        }
    }

    return 0;   
}

If you run this, you'll understand how this nested loop works. After you understand this code, printing the matrix should be easy.

Edited by Nick Evan: n/a

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