C++ Pointers & Functions Question:
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Explain function pointers?


A function has a physical location in the memory which is the entry point of the function. And this is the address used when a function is called. This address can be assigned to a pointer. Once a pointer points to a function, the function can be called through that pointer. Function pointers also allow functions to be passed as arguments to other functions. The address of a function is obtained by using the function’s name without any parenthesis or arguments.

Consider following example:

#include <iostream>
using namespace std;
void check(char *a, char *b, int (*cmp) (const char*, const*));
int numcmp(const char *a, const char *b);
int main()
char s1[80], s2[80];
gets (s1);
gets (s2);
if (isalpha(*s1))
check(s1, s2, strcmp);
check(s1, s2, numcmp);
return 0;
void check(char *a, char *b, int (*cmp) (const char*, const*))
cout <<”Testing for equality \n”;
cout <<“Equal”;
cout <<“ Not Equal”;
int numcmp(const char *a, const char *b)
if(atoi(a) == atoi(b))
return 0;
return 1;

In this function, if you enter a letter, strcmp() is passed to check() otherwise numcmp() is used.

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