So I'm working on a game with a weapon system. Each weapon has its own type of ammo. I want to create a pointer variable that, instead of having a value in and of itself, it instead points to the int for the active weapon's ammo. Here are my variables.

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "WeaponStats")
int shotgunAmmo = 10;
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "WeaponStats")
int rocketAmmo = 3;
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "WeaponStats")
int* ActiveAmmo;

I'd ideally set the pointer to link to the ammo types like this:

void ATopDownCharacter::SwitchWeapon(TEnumAsByte<Weapon> WeapToSwitchTo) {
WeapEnum = WeapToSwitchTo;

switch (WeapToSwitchTo)
{
case Weapon::Pistol:
fireRate = fRatePistol;
PrintScreen("switched to normal");
ActiveAmmo = 0;
break;

case Weapon::Shotgun:
fireRate = fRateShotgun;
PrintScreen("swithc to spread");
ActiveAmmo = &shotgunAmmo; //active ammo refers to shotgun ammo
break;

case Weapon::Rocket:
fireRate = rRateRocket;
PrintScreen("swithc to rocket");
ActiveAmmo = &rocketAmmo; //active ammo refers to rocket ammo
break;

default:
break;
}
}

This is so I can write more efficient code for stuff like displaying the remaining ammo for the current weapon (bind a widget to ActiveAmmo instead of doing a switch statement on the current active weapon) or make updating ammo values easier.

void ATopDownCharacter::UpdateAmmo(int AmmoAmnt)
{
  ActiveAmmo  = AmmoAmnt; //This would change whatever is currently set as active ammo by the inputted amount 
  return;
}

However, I get an error at my definition of the ActiveAmmo pointer, stating

Inappropriate "*" on variable of type "int32", cannot have exposed pointer to this type

I have no clue what to do at this point. Am I just fundamentally misunderstanding the use cases of pointers? I've been able to declare pointers for stuff like StaticMeshComponents with no issues, so I don't really get what the difference is between them and a simple integer.