zid.cpp: In function 'int main()': zid.cpp:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result zid.cpp:14: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result zid.cpp:8: warning: 'dr' may be used uninitialized in this function