Borderou de evaluare (job #417389)

Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:7:17: error: variable ‘std::ifstream cin’ has initializer but incomplete type user.cpp:8:18: error: variable ‘std::ofstream cout’ has initializer but incomplete type user.cpp:14:20: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] user.cpp:24:9: error: ‘prod’ was not declared in this scope user.cpp:32:13: error: ‘prod’ was not declared in this scope user.cpp:40:13: error: ‘prod’ was not declared in this scope user.cpp:41:9: error: expected ‘;’ before ‘}’ token user.cpp:43:11: error: ‘prod’ was not declared in this scope