How do I store a function to a variable?

Question

I think they are called functors? (it\'s been a while)

Basically, I want to store a pointer to a function in a variable, so I can specify what function I want to use

Answer 1

typedef unsigned int (*PGNSI)(unsigned int);

PGNSI variable1 = func_1;
PGNSI variable2 = func_2;