cds.cpp: In function 'int main()': cds.cpp:28: warning: unused variable 'x' cds.cpp:28: warning: unused variable 'y' cds.cpp:29: warning: unused variable 'g' cds.cpp:29: warning: unused variable 'h' cds.cpp:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result