cabana.cpp: In constructor 'instream::instream(const char*)': cabana.cpp:89: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result cabana.cpp: In constructor 'instream::instream(const char*)': cabana.cpp:89: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result cabana.cpp: In constructor 'instream::instream(const char*)': cabana.cpp:89: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result cabana.cpp: In member function 'void instream::advance()': cabana.cpp:115: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result cabana.cpp: In function 'int main()': cabana.cpp:133: warning: unused variable 'x' cabana.cpp:133: warning: unused variable 'y'