gheizere.cpp: In function 'int main()': gheizere.cpp:38: warning: unused variable 'j' gheizere.cpp:38: warning: unused variable 'xi' gheizere.cpp:38: warning: unused variable 'yi' gheizere.cpp:38: warning: unused variable 'k' gheizere.cpp:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result gheizere.cpp:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result gheizere.cpp:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result