Compilare: user.cpp: In function ‘int main()’: user.cpp:136:43: warning: left operand of comma operator has no effect [-Wunused-value] for(int i = st.lin, j = st.col; i <= dr.lin, j <= dr.col; i += L1 / CMMDC, j += l1 / CMMDC){ ^ user.cpp:141:42: warning: left operand of comma operator has no effect [-Wunused-value] for(int i = dr.lin, j = st.col; i >= st.lin, j <= dr.col; i -= L1 / CMMDC, j += l1 / CMMDC){ ^ user.cpp:153:43: warning: left operand of comma operator has no effect [-Wunused-value] for(int i = st.lin, j = st.col; i <= dr.lin, j <= dr.col; i += L2 / CMMDC, j += l2 / CMMDC){ ^ user.cpp:158:42: warning: left operand of comma operator has no effect [-Wunused-value] for(int i = dr.lin, j = st.col; i >= st.lin, j <= dr.col; i -= L2 / CMMDC, j += l2 / CMMDC){ ^