#include <iostream>
using namespace std;

class BigNum
{
private :
	int biggest;
	void determineBiggest ( int num) 
	{
		if (num > biggest) 
		biggest = num ;
	}
public :
	BigNum ()
	{
		biggest = 0 ; 
		bool examineNum(int);
		int getBiggest()
		{
			return biggest;
		}
	};

	bool BigNum::examineNum(int n) 
	{
		bool goodValue = true ;

		if (n>0)
			determineBiggest(n);
		else 
			goodValue = false;
		return goodValue;
}
	void getNumbers(BigNum&);

	int main()
	{
		Bignum stockShares;
		cout <<" This program determines which stock purchase involved\n"
			<<" the largest number of shares of stock. \n\n " ; 
		getNumbers(stockShares);
		cout << "\n The largest number of shares bought was " << stockShares.getBiggest()<<".\n";
		return 0;
	}
	
void getNumbers(BigNum &stock)
	{
		int NumTrans,
			NumShares;

		cout << " How many stock purchases have you made this month ? " ;
		cin >> numTrans;
		for ( int trans = 1; trans <=numTrans; trans++)
		{
			cout << " Purchase " << trans<< "shares purchased : " ;
			cin>> numShares;
			while (!stock.examineNum(numShares))
			{
				cout<< " The number entered should be greater than 0.\n "
					<< " Re-enter the number of stock shares purchased : ";
				cin >> numShares;
			}
        }
    }

Error 1 error C2535: 'void BigNum::getNumbers(BigNum &)' : member function already defined or declared c:\users\se7olutionyg\documents\visual studio 2008\projects\nau\nau\nau.cpp 47 Nau
Error 2 fatal error C1075: end of file found before the left brace '{' at 'c:\users\se7olutionyg\documents\visual studio 2008\projects\nau\nau\nau.cpp(5)' was matched c:\users\se7olutionyg\documents\visual studio 2008\projects\nau\nau\nau.cpp 66 Nau


there are erros , can anybody help me with that?

Sure.

C2535 - means you already defined a function with that name and parameter list. It's been a while for me in cpp, but try commenting out the prototype statement at line 34 above and see what happens.

C1075 - means you have some misplaced/mismatched braces. Check your opening and closing brace pairs for each block and you will find where your match(es) are missing or misplaced.

Hint - the two errors are quite closely related.