Compilare: user.cpp: In function ‘int main()’: user.cpp:42: warning: NULL used in arithmetic user.cpp:73: warning: operation on ‘dimrez’ may be undefined user.cpp:73: warning: operation on ‘dimrez’ may be undefined user.cpp:74: warning: operation on ‘dimrez’ may be undefined user.cpp:74: warning: operation on ‘dimrez’ may be undefined user.cpp:75: warning: operation on ‘dimrez’ may be undefined user.cpp:75: warning: operation on ‘dimrez’ may be undefined user.cpp:76: warning: operation on ‘dimrez’ may be undefined user.cpp:76: warning: operation on ‘dimrez’ may be undefined user.cpp:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int oper(char)’: user.cpp:31: warning: control reaches end of non-void function user.cpp: In function ‘int prior(char)’: user.cpp:24: warning: control reaches end of non-void function