Compilare: user.cpp: In function ‘int main()’: user.cpp:83:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] { case '*':st2[l-1]=st2[l-1]*st2[l--];break; ^ user.cpp:83:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] user.cpp:84:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] case '+':st2[l-1]=st2[l-1]+st2[l--]; break; ^ user.cpp:84:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] user.cpp:85:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] case '-':st2[l-1]=st2[l-1]-st2[l--]; break; ^ user.cpp:85:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] user.cpp:86:40: warning: operation on ‘l’ may be undefined [-Wsequence-point] case '/':st2[l-1]=st2[l-1]/st2[l--];break; ^ user.cpp:86:40: warning: operation on ‘l’ may be undefined [-Wsequence-point]