Unresloved Externals.....
is there trulyanything else in the world more evil?
you code for hours to find out YES! it compiles then, like a ton of bricks it hits you........unresolved eternals....
ARRGHHHHHHH
ok now that thats out :)
here is my code. it is in 3 linked source files
here is the header followed by the class definition, then the actual
program itself. any help is greatly appreciated.
Code:
#ifndef BUB_H
#define BUB_H
class sort
{
public:
sort();
~sort();
void bubble( int [], const int, bool (*)( int, int ) );
void swap(int * const, int * const);
};
#endif
// now the function list
#include <iostream>
using namespace std;
#include "BUB.H"
sort::sort()
{}
sort::~sort()
{}
void sort::bubble( int work[], const int size,
bool (*compare)( int, int ) )
{
void swap( int * const, int * const );
for ( int pass = 1; pass < size; pass++ )
for ( int count = 0; count < size - 1; count++ )
if ( (*compare)( work[ count ], work[ count + 1 ] ) )
swap( &work[ count ], &work[ count + 1 ] );
}
void sort::swap(int * const element1Ptr, int * const element2Ptr )
{
int temp;
temp = *element1Ptr;
*element1Ptr = *element2Ptr;
*element2Ptr = temp;
}
bool ascending( int a, int b )
{
return b < a;
}
bool descending( int a, int b )
{
return b > a;
}
// and the actual running program
#include <iostream>
using namespace std;
#include <iomanip>
using std::setw;
#include "BUB.H"
bool ascending( int, int );
bool descending( int, int );
int main()
{
sort b;
const int arraySize = 10;
int order,
counter,
a[ arraySize ] = { 2, 6, 4, 8, 10, 12, 89, 68, 45, 37 };
cout << "Enter 1 to sort in ascending order,\n"
<< "Enter 2 to sort in descending order: ";
cin >> order;
cout << "\nData items in original order\n";
for ( counter = 0; counter < arraySize; counter++ )
cout << setw( 4 ) << a[ counter ];
if ( order == 1 ) {
b.bubble( a, arraySize, ascending);
cout << "\nData items in ascending order\n";
}
else {
b.bubble( a, arraySize, descending);
cout << "\nData items in descending order\n";
}
for ( counter = 0; counter < arraySize; counter++ )
cout << setw( 4 ) << a[ counter ];
cout << endl;
return 0;
}
