Compilare: user.cpp: In function ‘int main()’: user.cpp:37:18: warning: unused variable ‘y’ [-Wunused-variable] unsigned i,x,y,n,m,e,j; ^ user.cpp:37:24: warning: unused variable ‘e’ [-Wunused-variable] unsigned i,x,y,n,m,e,j; ^ /tmp/ccsa2BKb.o: In function `main': user.cpp:(.text.startup+0x95): warning: the `gets' function is dangerous and should not be used.