Compilare: user.cpp: In function `int qsort1(long int, long int)': user.cpp:27: warning: control reaches end of non-void function user.cpp: In function `int qsort(long int, long int)': user.cpp:50: warning: control reaches end of non-void function user.cpp: In function `int main()': user.cpp:60: warning: long int format, int arg (arg 2)