问题
Which roles are used when i call a function with pointer argument unless declare the function before? I know that float are promoted to double and that are executed the integral promotion, but what happens at the pointers?
回答1:
Nothing. Default argument promotions don't apply to arguments of pointer type so they are left unchanged in type and value.
来源：https://stackoverflow.com/questions/14068058/default-argument-promotion-of-pointer