/in/foo.c: In function 'main':
/in/foo.c:14:16: warning: array subscript has type 'char' [-Wchar-subscripts]
         tabtemp[i] = tab[i];
                ^
/in/foo.c:14:25: warning: array subscript has type 'char' [-Wchar-subscripts]
         tabtemp[i] = tab[i];
                         ^
/in/foo.c:19:12: warning: array subscript has type 'char' [-Wchar-subscripts]
         tab[i] = tab[i+1];
            ^
/in/foo.c:24:12: warning: array subscript has type 'char' [-Wchar-subscripts]
         tab[i] = tab[i+2];
            ^
/in/foo.c:29:20: warning: array subscript has type 'char' [-Wchar-subscripts]
         sum += (tab[i] - '0') * (i + 1);
                    ^