read from file to string and pass to function

Question

I am having some issues trying to understand why I am getting a Exception thrown to this section when I am trying to pass a string that contains content from a getline() statement.

`reference operator[](const size_type _Off) { // subscript mutable sequence auto& _My_data = this->_Get_data(); _IDL_VERIFY(_Off <= _My_data._Mysize, "string subscript out of range"); return (_My_data._Myptr()[_Off]); }` void set_token(string n); string token; while (fin.peek() != '0' && !fin.eof()) { getline(fin, token); set_token(token); } `void set_token(string n) { string strarray[20]; string token; int size = sizeof(n); int i = 0; int j = 0; while (i < size) { if (n[i] != ' ' && n[i] != '\0') { token += n[i]; } else { strarray[j] = token; j++; token.clear(); lexical(strarray[j]); } i++; }`

@john it crashes before even executing a command in the set_token function. — Nignig
– Nignig, Commented Feb 28, 2018 at 6:50
@Nignig Often given advice is to use a debugger for this kind of problem. It would have found the problem very quickly — john
– john, Commented Feb 28, 2018 at 7:02

Archie Yalakki · Accepted Answer · 2018-02-28 09:36:37Z

I don’t see any problem in getline() but in set_token() there is obvious run-time issue when you extract the size of n. The sizeof doesn’t give you total number of characters in string but size() does.

Try this: size = n.size():

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