Compilare: user.cpp: In function ‘int main()’: user.cpp:16: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘long int*’ user.cpp:20: warning: format ‘%d’ expects type ‘int*’, but argument 2 has type ‘long int*’ user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ‘a1’ may be used uninitialized in this function user.cpp:14: warning: ‘b1’ may be used uninitialized in this function