Thread: QSORT --and undefined external

hi,
Im starting to read up on arrays.I copied some code and when i try to compile it I keep getting:

C:\Users\ghetto smurf\Documents\Visual Studio 2008\Projects\Array\Debug\Array.exe : fatal error LNK1120: 1 unresolved externals

here is the code

Code:

#include<iostream>
 

using namespace std;

//function definitions///////////////////////////////

int sortArray(const void *a,const void *b)
{
	int objA=*((int*)a);
	int objB=*((int*)b);
	if (objA<objB)
		return -1;
	if (objA==objB)
		return 0;
}
/////////////////////////////////////////////////////
int main()
{
	int someArray[]={12,23,31,4,5,16};
	int postion;

	qsort((void*)someArray,6,sizeof(someArray[0]),sortArray);

cin.get();
return 0;
}

I have a feeling im missing something obvious.Have i not included the libary that qsort is a member of?

I'm pretty sure you're missing:

Code:

 #include <stdlib.h>

Tried that and still showing the same error message.I have Double checked the code and its copied verbatim as far as i can tell..

It works fine with me...

Code:

#include<iostream>
#include <stdlib.h>

using namespace std;

//function definitions///////////////////////////////

int sortArray(const void *a,const void *b)
{
	int objA=*((int*)a);
	int objB=*((int*)b);
	if (objA<objB)
		return -1;
	if (objA==objB)
		return 0;
}
/////////////////////////////////////////////////////
int main()
{
	int someArray[]={12,23,31,4,5,16};
	int postion;

	qsort((void*)someArray,6,sizeof(someArray[0]),sortArray);
        for(int i = 0;i<6;i++){
            cout << someArray[i] << endl;
        }
    cin.get();
    return 0;
}

However, I don't think the sortArray function works correctly. I don't know what you want it to do though..

thx will try that ...seems alot less complex.No it doesnt mention what the external that is undefined(i think it normally does with varibles).

thx all....and ghetto smurf is my real name