Passing an Array

[Jpeg6]

I'm having trouble transferring my transposed array to my print subroutine. I could really use some help.

#include <stdio.h>

float transposeMatrix (int input_row, int input_col, float input_matrix[][20])
{
	int row;
	int col;
	float tran_matrix[20][20]={0};
	
	for (row=0; row<=input_col; row++)
	{
		for (col=0; col<=input_row; col++)
		{
			(tran_matrix[row][col])=(input_matrix[col][row]);
		}
	}
	return tran_matrix;

}



void printMatrix (int input_row, int input_col, float input_matrix[][20]) 
{
	int row;
	int col;
	int upcol;
	

	for (row=0; row<input_row; row++)
	{
	printf("|--------|");
	
		for (upcol=1; upcol<input_col; upcol++)
		{
		printf("--------|");
		}

		printf("\n \n");

		for (col=0; col<input_col; col++)
		{
			printf("| ");
			printf("%+6.1f ", input_matrix[row][col]);
		}
		printf("| \n \n");
	}
	printf("|--------|");
	
	for (upcol=1; upcol<input_col; upcol++)
	{
		printf("--------|");		
	}

	printf ("\n");

}


int main (void)
{
	int user_row;
	int user_col;
	int row;
	int col;
	float input_array[20][20]={0};
	float t_matrix={0};
	int rows;
	int columns;

	// Scans for user input of rows and columns.
	printf ("Number of Rows: ");
	scanf ("%d", &user_row);
	printf ("Number of Columns: ");
	scanf ("%d", &user_col);

	// Scans for user input of number entry. 
	for (row=0; row<user_row; row++)
	{
		for (col=0; col<user_col; col++)
		{
			scanf ("%f", &input_array[row][col]);
		}

	}

	printf("Original Matrix: \n");
	printMatrix ( user_row, user_col, input_array);

	t_matrix=(transposeMatrix( user_row, user_col, input_array));
	
	printf("Transposed Matrix: \n");
	printMatrix (user_row, user_col, t_matrix);


}

The final line is where I'm having trouble.

[itsme86]

t_matrix is actually a float **. You'll have to change your transposeMatrix() function definition so that it returns that type and then change your definition of t_matrix from float to float ** in main().

[Jpeg6]

I really don't understand what your trying to tell me to do. Could you be a little more specific to help me out some more?

[itsme86]

float transposeMatrix (int input_row, int input_col, float input_matrix[][20])

... becomes ...

float **transposeMatrix (int input_row, int input_col, float input_matrix[][20])

And I bet you can figure out how to redefine t_matrix in main() now...

[Salem]

See answers in your other thread on the same subject.

> ... becomes ...
> float **
Er - no - TWICE!
1. It's the wrong type, ** is not a pointer to a 2D array.
2. It would be a pointer to a local variable anyway.

I'm shocked

[itsme86]

See answers in your other thread on the same subject.

> ... becomes ...
> float **
Er - no - TWICE!
1. It's the wrong type, ** is not a pointer to a 2D array.
2. It would be a pointer to a local variable anyway.

I'm shocked

Oops! Heh. That's what I get for posting drunk.