Overloaded function

[ravikiran]

Hi ,
i have a sample code like this for Overloading property in C++

i have defined these functions

    void fun(short a1)
      {
        //to do code here
      }  
      void fun(int a1)
      {
        //to do code here
      }

and now in main i make a call like this

fun(10)

which function will get invoke in this case

Similarly if i have functions like this

    void fun(long a1)
      {
        //to do code here
      }  
      void fun(int a1)
      {
        //to do code here
      }

and in main ->

fun(10) 

which function will get invoke in this case

plz explain me with this example.

Thanks & Regards,
Ravi kiran

[Ganon11]

I wasn't sure what would happen, so I wrote a short test program to see:

#include <iostream>
using namespace std;
 
void fun(int);
void fun(long);
 
int main() {
    cout << "testing overloaded functions" << endl;
 
    fun(10);
 
    system("pause");
    return 0;
}
 
void fun(int x) {
    cout << "int fun() execution - x is " << x << endl;
}
 
void fun(long x) {
    cout << "long fun() execution - x is " << x << endl;
}

During the run, the void fun(int x) function was executed instead of the long. Replacing the long with short (a.k.a. void fun(short x)), the int function still executed. This may be compiler specific, though - I used Bloodshed Dev C++ 4.9.9.2 to write this.

[AdrianH]

Hi,

I’ve looked up the grammar to C++ and found it here

Here is an excerpt:

    integer-suffix:
        unsigned-suffix long-suffix_opt
        long-suffix unsigned-suffix_opt
 
    unsigned-suffix: one of
        u  U
 
    long-suffix: one of
        l  L
 

What this is saying is that an integer suffix (which is optional) can be “u”, “l”, “ul”, or “lu”. (opt means optional). So it looks like you cannot state a literal number that is of type short. If you want to use a short as a type for overloading, it will be beat out by other literal integer types unless you cast it.

Also, you could have tested this yourself and then ask "why does this happen?" May I ask why you didn't?


Adrian