// THIS
int id = 0;
Skill* skill = tryAttack1(&id) || tryAttack2(&id);
if(id == 1)
{

}
else if(id == 2)
{

}


// OR THIS
do
{
    Skill* skill;
    skill = tryAttack1();
    if(skill)
    {
        // ...
        break;
    }
    skill = tryAttack2();
    if(skill)
    {
        // ...
        break;
    }
} while(0);