Compilare: user.cpp: In function ‘int main()’: user.cpp:47:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] if (fp[i]=='+') { stv[--vf]=stv[vf]+stv[vf+1]; continue; } ^ user.cpp:47:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] user.cpp:48:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] if (fp[i]=='-') { stv[--vf]=stv[vf]-stv[vf+1]; continue; } ^ user.cpp:48:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] user.cpp:49:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] if (fp[i]=='/') { stv[--vf]=stv[vf]/stv[vf+1]; continue; } ^ user.cpp:49:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] user.cpp:50:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point] if (fp[i]=='*') { stv[--vf]=stv[vf]*stv[vf+1]; continue; } ^ user.cpp:50:50: warning: operation on ‘vf’ may be undefined [-Wsequence-point]