trivial problem about function ptr

See more:

C++

int func_s(int){return 1;}
typedef int (*FUNC_C)(int);
FUNC_C f = func_s;   //(1)
FUNC_C f = &func_s;  //(2)

Both (1),(2) compiled OK!(under vs2005).
I just don't know the difference? what's the '&'function in (2)?

thanks in advance.