Compilare: user.cpp: In function ‘int main()’: user.cpp:9: warning: unused variable ‘r1’ user.cpp:9: warning: unused variable ‘r2’ user.cpp:9: warning: ‘a’ may be used uninitialized in this function user.cpp:9: warning: ‘b’ may be used uninitialized in this function user.cpp:9: warning: ‘c’ may be used uninitialized in this function