Compilare: user.cpp: In function ‘int main()’: user.cpp:37:17: warning: unused variable ‘a’ [-Wunused-variable] long nr=0,i,a,b,p; ^ user.cpp:37:19: warning: unused variable ‘b’ [-Wunused-variable] long nr=0,i,a,b,p; ^ user.cpp: In function ‘int nth(int, int, int)’: user.cpp:34:1: warning: control reaches end of non-void function [-Wreturn-type] } ^