Compilare: user.cpp: In function ‘int invmod(int)’: user.cpp:65:9: warning: unused variable ‘b’ [-Wunused-variable] int b,d,x,y; ^ user.cpp:65:11: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] int b,d,x,y; ^ user.cpp: In function ‘int main()’: user.cpp:92:18: warning: unused variable ‘i’ [-Wunused-variable] register int i,j,t; ^ user.cpp:92:20: warning: unused variable ‘j’ [-Wunused-variable] register int i,j,t; ^