Compilare: user.cpp: In function ‘int main()’: user.cpp:163: warning: comparison between signed and unsigned integer expressions user.cpp:172: warning: comparison between signed and unsigned integer expressions user.cpp:114: warning: unused variable ‘start’ user.cpp:193: warning: unused variable ‘stop’ user.cpp:116: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:117: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:119: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:128: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:149: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result