Compilare: user.cpp:2:10: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix] #include <fstream>unsigned int ^ user.cpp:2:19: warning: extra tokens at end of #include directive [enabled by default] #include <fstream>unsigned int ^ user.cpp: In function ‘int main()’: user.cpp:55:26: warning: unused variable ‘a’ [-Wunused-variable] unsigned int a,x1,x2; ^ user.cpp:61:30: warning: unused variable ‘a’ [-Wunused-variable] unsigned int a,x1,x2; ^