robot1.cpp: In function 'void add()': robot1.cpp:12: warning: comparison between signed and unsigned integer expressions robot1.cpp: In function 'void read()': robot1.cpp:42: warning: format '%d' expects type 'int*', but argument 2 has type 'long long unsigned int*' robot1.cpp:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result robot1.cpp:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result robot1.cpp: In function 'void print()': robot1.cpp:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result