SubString(&Sub, S, pos, len) ClearString(&s) Index(s, T, pos Replace(&s, T, v) StrInsert(&s, pos, T) StrDelete(&s, pos, len) 3 ADT StringSubString (&Sub, S, pos, len) Index (S, T, pos) Replace (&S, T, V) StrInsert (&S, pos, T) StrDelete (&S, pos, len) ClearString (&S) } ADT String