Give the proper pre- and post- conditions for each of the following

1. 	void swapValue (ArrayList a)
   	// Pre :
   
   	// Post:
   
   
   	{ 
   		int n = a.size( );
   		Integer zero = new Integer(0);
   		for (int index = 0; index < n; index++)
   			if (a.get(index).equals(zero))
   				a.set(index, new Integer(1));
   	}			
   

2. 	int findScore (ArrayList scores)
   	// Pre :
   
   	// Post:
   
   
   	{
   		int n = scores.size( );
   		Integer fifty = new Integer(50);
   		for (int index = 0; index < n; index++)
   			if (scores.get(index) < fifty )
   				return index;
   		return n;
   	}
   

3. 	void multiples ( )
   	// pre :
   
   
   	// post:
   
   
   	{
   		System.out.print("Of what number?");
   		int num = TextIO.getlnInt();
   		for (int j = 1; j <= 100; j++)
   			if (j % num == 0)
   				System.out.print(j + " ");
   	}