Transpose Matrix array manipulation

Hi guys I am working on this program
Array Manipulation - Transpose of a Square Matrix: This program reads a matrix (two dimensional array), displays its contents, transposes it and then displays the transposed matrix.
and here's the code

Code:

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#include <iostream.h>

const int arraySize = 3;

void readMatrix(int arr[][arraySize]);
void displayMatrix(int a[][arraySize]);
void transposeMatrix(int a[][arraySize]);

void main(void)
{

int a[arraySize][arraySize];

readMatrix(a); //Read the matric element int the array

cout<<"\n\n"<<"The original matrix is:"<<'\n'; //Display the matrix

displayMatrix(a);

transposeMatrix(a); //transpose the matrix

cout<<"\n\n"<<"The transposed matrix is:" << '\n'; //Display the transposed matrix
displayMatrix(a);
}

void readMatrix(int arr[][arraySize])
{
    int row, col;
   
    for(row = 0; row<arraySize;row++)
    {
            for(col=0; col<arraySize; col++)
            {
                        cout<<"\n"<<"Enter"<<row<<","<<col<<"element";
                        cin>>arr[row][col];
                        }
                        cout<<'\n';
                        }
                        }
            void displayMatrix(int a[][arraySize])
            {
                  int row,col;
                  for (row=0; row<arraySize;row++)
                  {
                      for(col=0; col<arraySize; col++)
                      {
                                cout<<a[row][col]<<'\t';
                                }
                                cout<<'\n';
                                }
                                }
                      void trnasposeMatrix(int a[][arraySize])
                      {
                            int row,col;
                            int temp;
                            for(row=0; row < arraySize; row++)
                            {
                            for(col=row; col<arraySize;col++)
                            {
                            temp=a[row][col]; //save the original value in the temp variable
                            a[row][col]=a[col][row];
                            a[col][row]=temp; //take out the original value
                            }
                            }
                            }

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When I compile the program it says 'mail' must return 'int' I think everything is right please help me on this....

The compiler is correct. "main" must return an integer:

Code:

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#include <iostream>

int main()
{
  std::cout << "Hello World!" << std::endl;
}

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However, you do not need to provide the return value (IIRC, the default is 0, but I could be wrong).

Viggy

Quote:

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Originally Posted by princemoon

I think everything is right please help me on this....

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Code:

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#include <iostream.h>

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What compiler are you using? There is no such header as <iostream.h> in ANSI C++.

Correction:

Code:

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#include <iostream>

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The standard header is <iostream>, not <iostream.h>. If you're reading a book that uses <iostream.h> get a newer or different book. If you're using code gotten from a website with <iostream.h>, go to a better or newer website. If you are being taught <iostream.h> by a teacher, get a new teacher.

Regards,

Paul McKenzie