Question

Trying to split a string out into parts. The format will always be like this name from number on date

need to split out name, number, and date

code:

string name, number, date;

size_t from = s.find(" from ");
size_t on = s.find(" on ");

name = s.substr(0, from);
number = s.substr(from + 6, on);
date = s.substr(on + 4);

cout << "name:" << name << ", num:" << number << ", date:" << date << endl;

sample input: John Smith from N656 on 01012013

sampe output: name:John Smith, num: N656 on 01012013, date:01012013

So there’s obviously a problem when trying to create the substring number but I’m very curious what could be causing this since the other two are working.

Answer 1

I think you’re assuming that s.substr accepts start/end index.

This is what it actually is:
s.substr(pos, size)

pos position of the first character to include
size length of substring

So, in an ugly way:

name = s.substr(0, from);
number = s.substr(from + 6, on - (from + 6));
date = s.substr(on + 4);