Compilare: user.cpp: In function ‘int main()’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp:22: warning: suggest parentheses around comparison in operand of ‘&’ user.cpp:41: warning: comparison between signed and unsigned integer expressions user.cpp:38: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:11: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result