prepare (1/3): 
finished

make (2/3): 
g++ -o main main.cpp comparison.cpp
main.cpp: In function 'int main()':
main.cpp:21:42: error: too many arguments to function 'void selectionSort(int*, long int)'
     if(key==2) selectionSort(arr,0,size-1);
                                          ^
In file included from main.cpp:3:0:
comparison.h:11:6: note: declared here
 void selectionSort(int arr[], long n);
      ^~~~~~~~~~~~~
Makefile:2: recipe for target 'all' failed
make: *** [all] Error 1

build failed