Изменение значений переменных членов объекта C++

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Specify a void function called battle (). This function will accept two Player type objects and a double type variable. The function will control which of them
two players have a higher level and will add to that player's experience
the value of the variable of type double. In essence the double variable will get one
a value that corresponds to the experience of winning a battle. Unlike
previous work here we want to change the value of the winner's experience! In case

where both players have the same level to display the message ΄Tie΄.

может ли кто-нибудь помочь мне найти истину?

Что я уже пробовал:

void battle(Player &player , Player &player1 , double battle_xp){
				battle_xp = 1000;
				
				if (player.level > player1.level){
					player.getExp() == player.getExp() + battle_xp;
					player.setExp(player.getExp());
									}
				else if (player.level < player1.level){
					player1.getExp() == player1.getExp() + battle_xp;
					player1.setExp(player.getExp());
				}
				else{
					cout << "Tie \n";
				}		
			};

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