Compilare: user.cpp: In function ‘void drum(int, int, int)’: user.cpp:17:20: warning: left operand of comma operator has no effect [-Wunused-value] if (x,y-q[ko]>=0) ^ user.cpp:25:9: warning: left operand of comma operator has no effect [-Wunused-value] if (x-q[ko],y>=0) ^ user.cpp: In function ‘int main()’: user.cpp:55:23: warning: left operand of comma operator has no effect [-Wunused-value] if (j+q[i],h>=0) ^ user.cpp:61:32: warning: left operand of comma operator has no effect [-Wunused-value] if (j,q[i]+h>=0) ^