Function pointer used to do bubble sort in C++

/*
 Function Pointer used for bubble sort
*/

#include "iostream"
using namespace std;

int compare(int i, int j){
 if(i>j) return 1;
 else return -1;

}

void bubbleSort(int A[], int n, int (*ptr)(int, int)){
 int temp=0;
 for(int i=0; i<n; i++){
  for(int j=0; j<n; j++){
   if(ptr(A[j],A[j+1])>0){
    temp = A[j];
    A[j] = A[j+1];
    A[j+1] = temp;
   }
  } 
 }

}
int main(){
 int arr[] = {3,1,6,2,4,5};
 bubbleSort(arr,6, compare);
 for(int i=0; i<6; i++) cout<<" "<<arr[i] ;
 cout<<endl;

}
/*
 OUTPUT 
[pavan@localhost Function-Pointer]$ g++ FPBubbleSort.cpp
[pavan@localhost Function-Pointer]$ ./a.out 
 1 2 3 4 5 6
[pavan@localhost Function-Pointer]$ 

*/