Two ways to make use of it:

1) directly declare a function pointer variable at the place where it's required. like below:

void (*pFunc)(int); // pFunc is a variable here

pFunc = &FuncA;

pFunc(2);

2) typedef a function poiner type and then use it. like below:

typedef void (*pFunc)(int);

pFunc pFuncObj = &FuncA;

pFuncObj(2);