Compilare: user.cpp: In function ‘int main()’: user.cpp:24:11: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>>s+1; ^ user.cpp:64:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf>0&&pr[op[vf]]>pr[s[i]]) ^ user.cpp:64:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf>0&&pr[op[vf]]>pr[s[i]]) ^ user.cpp: In function ‘int calcul(char, int, int)’: user.cpp:18:1: warning: control reaches end of non-void function [-Wreturn-type] } ^