Compilare: user.cpp: In function ‘void cit()’: user.cpp:12:21: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[200002]’ [-Wformat=] scanf("%s",&expr); ^ user.cpp: In function ‘void eval()’: user.cpp:117:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] case '*':st[st1-2]=st[--st1]*st[--st1];break; ^ user.cpp:117:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] user.cpp:118:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] case '/':st[st1-2]=st[st1-2]/st[--st1];--st1;break; ^ user.cpp:118:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] user.cpp:119:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] case '+':st[st1-2]=st[--st1]+st[--st1];break; ^ user.cpp:119:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] user.cpp:120:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point] case '-':st[st1-2]=st[st1-2]-st[--st1];--st1;break; ^ user.cpp:120:64: warning: operation on ‘st1’ may be undefined [-Wsequence-point]