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:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccrLQSkW.o: In function `main': user.cpp:(.text+0x5b): warning: the `gets' function is dangerous and should not be used.