Compilare: user.cpp: In function ‘int main()’: user.cpp:9:17: warning: unused variable ‘mod’ [-Wunused-variable] int n,i,s=0,mod,cat=0,j,nr=0; ^ user.cpp:9:21: warning: unused variable ‘cat’ [-Wunused-variable] int n,i,s=0,mod,cat=0,j,nr=0; ^