Compilare: user.cpp: In function ‘int main()’: user.cpp:52:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] else if (fp[i]=='+') stiva[--k]=stiva[k]+stiva[k+1]; ^ user.cpp:52:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] user.cpp:53:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] else if (fp[i]=='-') stiva[--k]=stiva[k]-stiva[k+1]; ^ user.cpp:53:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] user.cpp:54:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] else if (fp[i]=='*') stiva[--k]=stiva[k]*stiva[k+1]; ^ user.cpp:54:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] user.cpp:55:64: warning: operation on ‘k’ may be undefined [-Wsequence-point] else if (fp[i]=='/') stiva[--k]=stiva[k]/stiva[k+1]; ^ user.cpp:55:64: warning: operation on ‘k’ may be undefined [-Wsequence-point]