Borderou de evaluare (job #31426)

Compilare: user.cpp: In function ‘int main()’: user.cpp:18:11: warning: unused variable ‘a’ [-Wunused-variable] user.cpp:18:13: warning: unused variable ‘b’ [-Wunused-variable] user.cpp:18:21: warning: variable ‘prev’ set but not used [-Wunused-but-set-variable] user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:19:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:20:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:23:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]