Compilare: user.cpp: In function ‘void readinput()’: user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp:22: warning: name lookup of ‘i’ changed user.cpp:7: warning: matches this ‘i’ under ISO standard rules user.cpp:16: warning: matches this ‘i’ under old rules user.cpp:13: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void go(unsigned int)’: user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp:36: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void writeoutput()’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result