#include #include #include #include #include enum userInputNum { input_SignUp = 1, input_Login = 2, input_Exit = 4, input_Admin = 3 }; struct Member { char username[50]; char password[50]; char password_hash[50]; char checkPassword[50]; }; struct Member members[100]; int memberCount = 0; void clearInputBuffer() { int c; while((c = getchar()) != '\n' && c != EOF); } void signUp(); void login(); v..