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Interview Q & A >> C++ >> What are function pointers?

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What are function pointers? (Views: 1681)


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0        0

Function Pointers are pointers, i.e. variables, which point to the address of a function.

Submitted By: Anonymous | Created On: 7/13/2009 9:14:56 AM

1        0

A function pointer always points to a function with a specific signature. Thus all functions, you want to use with the same function pointer, must have the same parameters and return-type.

Submitted By: Anonymous | Created On: 7/13/2009 9:15:47 AM

2        0

Pointer to a function . Function pointers are used for callbacks, and can be used whereever virtual function mechanism is needed.

#include <iostream.h>
int f1()
{
        cout<<"f1 function called";
        return 5;
}
void main()
{
    int i=0;
    int (*fPtr) ();         //Function pointer declaration
    fPtr=f1;                 //Function assigned to function pointer
    i=fPtr();                 //Calling the function using function pointer
    cout<<endl;
    cout<<i;
}

Output:
f1 function called
5


Submitted By: SV | Created On: 6/5/2011 10:54:49 PM


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