turn1.cpp: In member function 'void Tower::print()': turn1.cpp:12: warning: comparison between signed and unsigned integer expressions turn1.cpp: In function 'void connect_two(int, int)': turn1.cpp:54: warning: comparison between signed and unsigned integer expressions turn1.cpp: In function 'void read_graph()': turn1.cpp:66: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result turn1.cpp:74: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result