Compilare: user.cpp: In function ‘int main()’: user.cpp:24: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘short int*’ user.cpp:24: warning: format ‘%d’ expects type ‘int*’, but argument 3 has type ‘short int*’ user.cpp:28: warning: unused variable ‘act’ user.cpp:28: warning: unused variable ‘pre’ user.cpp:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result