submatrix1.cpp: In function 'unsigned int getInt()': submatrix1.cpp:24: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result submatrix1.cpp:28: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result