Compilare: user.cpp: In function ‘int fact(int)’: user.cpp:18:13: warning: unused variable ‘k’ [-Wunused-variable] int k,c=0,p=0,q=1,o=0; ^ user.cpp:18:23: warning: unused variable ‘q’ [-Wunused-variable] int k,c=0,p=0,q=1,o=0; ^ user.cpp:18:27: warning: unused variable ‘o’ [-Wunused-variable] int k,c=0,p=0,q=1,o=0; ^ user.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^