int enter_matrix(matrix_struct *matrix_a, matrix_struct *matrix_b)
{


    int choice,no_of_rows,no_of_columns, row, col;
    int* row_p,column_p;
    int** matrix_a_p, matrix_b_p, matrix_c_p;

    int no_of_columns_a, no_of_rows_a;


    //free previous memory to avoid leaks.

    free(matrix_a->matrix);
    free(matrix_b->matrix);



    printf("\nPlease enter number of rows in Matrix a: ");
            scanf("%d",&matrix_a->no_of_rows);
            printf("\n\nPlease enter number of columns in Matrix: ");
            scanf("%d",&matrix_a->no_of_columns);


            //allocate memory for rows

            
			matrix_a->matrix=(float**)(malloc((matrix_a->no_of_rows)*sizeof(float*)));

            //allocate memory for each row of the matrix

            for(row=0;row<(matrix_a->no_of_rows);row++)
{
             matrix_a->matrix[row]=(float*)(malloc((matrix_a->no_of_columns)*sizeof(float))); //error
}

//formatting seems to have been mucked up by the pasting :S


            //enter values into matrix

            for(row=0; row<(matrix_a->no_of_rows); row++)
            {
                for(col=0; col<(matrix_a->no_of_columns); col++)
                {
                    printf("\nPlease enter value for row %d and column %d:",row,col);
                    scanf("%f",&matrix_a->matrix[row][col]);
                }
            }

            printf("You entered:\n\n");

            for(row=0;row<(matrix_a->no_of_rows); row++)
            {
                printf("\n");

                for(col=0;col<(matrix_a->no_of_columns);col++)
                    printf("%f ",matrix_a->matrix[row][col]);
            }
 

    //free previous memory to avoid leaks.

    free(matrix_a->matrix);
    free(matrix_b->matrix);
 

for(row=0;row<(matrix_a->no_of_rows);row++){
  fprintf(stderr,"Loop %d\n",row);
  matrix_a->matrix[row]=(float* )(malloc((matrix_a->no_of_columns)*sizeof(float))); 
}