Compilare: user.cpp: In function ‘int main()’: user.cpp:10:27: warning: statement has no effect [-Wunused-value] for(i=r;i>=2;i--) {b/r==0;a/r==0;g<<i;} ^ user.cpp:10:34: warning: statement has no effect [-Wunused-value] for(i=r;i>=2;i--) {b/r==0;a/r==0;g<<i;} ^