Compilare: user.cpp: In function 'int main()': user.cpp:23: warning: format '%ld' expects type 'long int*', but argument 2 has type 'long int' user.cpp:23: warning: format '%ld' expects type 'long int*', but argument 3 has type 'long int' user.cpp: In function 'long int cmmdc(long int, long int)': user.cpp:5: warning: 'r' is used uninitialized in this function