Compilare: user.cpp: In function ‘int euclid_extins(long int, long int, long int, long int&, long int&)’: user.cpp:6: warning: unused variable ‘cmmdc’ user.cpp: In function ‘int main()’: user.cpp:29: warning: format ‘%ld’ expects type ‘long int’, but argument 3 has type ‘int’ user.cpp:29: warning: format ‘%ld’ expects type ‘long int’, but argument 4 has type ‘int’ user.cpp:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int euclid_extins(long int, long int, long int, long int&, long int&)’: user.cpp:15: warning: control reaches end of non-void function