dotnet.cpp: In function 'int main()': dotnet.cpp:82: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dotnet.cpp:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dotnet.cpp:88: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result dotnet.cpp:91: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result dotnet.cpp:96: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result dotnet.cpp:99: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result dotnet.cpp:105: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result