Borderou de evaluare (job #289653)

Eroare de compilare: user.cpp: In function 'int main()': user.cpp:23:16: error: 'is' was not declared in this scope user.cpp:24:5: error: expected ';' before '}' token user.cpp:6:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:7:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:10:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]