valet.cpp: In function 'int main()': valet.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result valet.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result valet.cpp:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result valet.cpp:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result valet.cpp:21: warning: 'hx' may be used uninitialized in this function valet.cpp:21: warning: 'hy' may be used uninitialized in this function valet.cpp:21: warning: 'cx' may be used uninitialized in this function valet.cpp:21: warning: 'cy' may be used uninitialized in this function