Compilare: user.cpp: In function ‘long long int suma(long long int, long long int)’: user.cpp:13: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result