Compilare: user.cpp: In function ‘int main()’: user.cpp:27:16: warning: right operand of comma operator has no effect [-Wunused-value] f >> a , b ; ^ user.cpp:11:18: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] b = a % b ; ^ user.cpp:25:13: note: ‘b’ was declared here int a , b ; ^