Compilare: user.cpp: In function ‘int main()’: user.cpp:46:15: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(i==1&&s[i-1]=='-'||i>1&&s[i-1]=='-'&&strchr("+-/*(",s[i-2])!=0) ^ user.cpp:52:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v1>0&&pr[s[i]]<=pr[op[v1]]){ ^ user.cpp:52:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v1>0&&pr[s[i]]<=pr[op[v1]]){ ^ user.cpp: In function ‘int calcul(int, int, char)’: user.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] } ^