Compilare: user.cpp: In function ‘int ultima_cifra(int)’: user.cpp:45: warning: unused variable ‘rest’ user.cpp: In function ‘int main()’: user.cpp:84: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:90: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int ultima_cifra(int)’: user.cpp:65: warning: control reaches end of non-void function