Compilare: user.cpp: In function ‘int main()’: user.cpp:18: warning: format ‘%ld’ expects type ‘long int*’, but argument 2 has type ‘long long int*’ user.cpp:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:13: 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:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘char* gets(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 /tmp/ccPwsY3W.o: In function `main': user.cpp:(.text+0x91): warning: the `gets' function is dangerous and should not be used.