Compilare: user.cpp: In function ‘int ok(int)’: user.cpp:5:9: warning: variable ‘u’ set but not used [-Wunused-but-set-variable] int u,s,i,nt=0,l; ^ user.cpp:5:20: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int u,s,i,nt=0,l; ^ user.cpp: In function ‘int main()’: user.cpp:55:22: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘int’ [-Wformat=] printf("%ld",cb()); ^