The common way of calling a function through a pointer is using the pointer as if it were a function. In other words, if p is a pointer to a function called f:
int f(int n){ return n;}int (*p)(int)=f;
Then there’s no syntactic difference between calling f() directly, e.g.,
int m=f(n);
and calling f() through the pointer p:
int m=p(n);
However, it is allowed to use the (*p)(n) to call a function through a pointer:
int m=(*p)(n);
This form was prevalent in pre-standard C and is still permitted today. You shouldn’t use it new code. However, it’s very common in legacy code so you should be familiar with it.
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