graf.cpp: In function 'void dx(int)': graf.cpp:18: warning: comparison between signed and unsigned integer expressions graf.cpp: In function 'void dy(int)': graf.cpp:39: warning: comparison between signed and unsigned integer expressions graf.cpp: In function 'int main()': graf.cpp:56: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result graf.cpp:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result graf.cpp:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result graf.cpp:62: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result