Compilare: user.cpp: In function ‘int main()’: user.cpp:41:9: warning: unused variable ‘s’ [-Wunused-variable] int s, pd=0, t=0; ^ user.cpp:41:12: warning: unused variable ‘pd’ [-Wunused-variable] int s, pd=0, t=0; ^ user.cpp:41:18: warning: unused variable ‘t’ [-Wunused-variable] int s, pd=0, t=0; ^ user.cpp:42:10: warning: unused variable ‘c’ [-Wunused-variable] char c, ca=0; ^