Compilare: user.cpp: In function ‘int main()’: user.cpp:50:13: warning: unused variable ‘op’ [-Wunused-variable] int n,x,op,nr,nr2,j=0; ^ user.cpp:50:16: warning: unused variable ‘nr’ [-Wunused-variable] int n,x,op,nr,nr2,j=0; ^ user.cpp:50:19: warning: unused variable ‘nr2’ [-Wunused-variable] int n,x,op,nr,nr2,j=0; ^ user.cpp:50:23: warning: unused variable ‘j’ [-Wunused-variable] int n,x,op,nr,nr2,j=0; ^