panouri.cpp: In function 'void read()': panouri.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result panouri.cpp:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result panouri.cpp:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result panouri.cpp:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result panouri.cpp: In function 'int seek()': panouri.cpp:30: warning: unused variable 'i' panouri.cpp:30: warning: unused variable 'j' panouri.cpp: In function 'void write()': panouri.cpp:59: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result