patrate2.cpp: In function 'int main()': patrate2.cpp:20: warning: unused variable 'x' patrate2.cpp:20: warning: unused variable 'y' patrate2.cpp:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result patrate2.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result patrate2.cpp:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result patrate2.cpp:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result patrate2.cpp:20: warning: 'ci' may be used uninitialized in this function