What is function pointer? How does it work, give example?

C/C++ language has a feature which allows function pointer to be declared as a pointer variable.
Syntax of a function pointer is as follows:

<return type> (*<pointer name>)(<arguments>); or
 
typedef <return type> (*<pointer name>)(<arguments>);

Here is an example of addition using function pointer.

int add(int a, int b)
{
  return (a + b);
}
typedef int (add_proc)(int a, int b);
int main(int argc, char *argv[])
{
  add_proc add_ptr;
  int a = 1, b = 2, c;
  add_ptr = add;
  c = add_ptr(a, b);
}

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