Compilare: user.cpp: In function ‘int main()’: user.cpp:20:9: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>s+1; ^ user.cpp:45:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf>0&&pr[s[i]]<=pr[op[vf]]){ ^ user.cpp:45:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf>0&&pr[s[i]]<=pr[op[vf]]){ ^ user.cpp: In function ‘int calcul(char, int, int)’: user.cpp:13:1: warning: control reaches end of non-void function [-Wreturn-type] } ^