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Nov 21st, 2007

atoi(string.substr(x,x)) Possible?

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Hi I wish to break up a date entered as a string into ints for day, month, year.
String to be entered follows this convention DDMMYYYY - this will be checked so we can presume it's suitable.

I have it working using tempary variables, but is there a way to do it in one call?

c Syntax (Toggle Plain Text)
Person getPerson() {
  Person person;
  string dob, temp;
  int date;
  cout << "\nEnter name: ";
  getline(cin, person.name);
  cout << "\nEnter title: ";
  getline(cin, person.title);
  do {
    cout << "\nEnter DOB (DDMMYYYY): ";
    cin >> dob;
    if (atoi(dob.c_str())) break;
  } while (!atoi(dob.c_str()));
 
  temp = dob.substr(0,2);
  cout << temp; // Sanity check
  person.dob.d = atoi(temp.c_str());
  //person.dob.m = atoi(dob.substr(2,3)); Doesn't work : cannot convert parameter 1 from     'std::basic_string<_Elem,_Traits,_Ax>::_Myt' to 'const char *'
  //person.dob.y = atoi(dob.substr(4,7));
  return person;
}
Person getPerson() {
  Person person;
  string dob, temp;
  int date;
  cout << "\nEnter name: ";
  getline(cin, person.name);
  cout << "\nEnter title: ";
  getline(cin, person.title);
  do {
    cout << "\nEnter DOB (DDMMYYYY): ";
    cin >> dob;
    if (atoi(dob.c_str())) break;
  } while (!atoi(dob.c_str()));

  temp = dob.substr(0,2);
  cout << temp; // Sanity check
  person.dob.d = atoi(temp.c_str());
  //person.dob.m = atoi(dob.substr(2,3)); Doesn't work : cannot convert parameter 1 from     'std::basic_string<_Elem,_Traits,_Ax>::_Myt' to 'const char *'
  //person.dob.y = atoi(dob.substr(4,7));
  return person;
}

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alcoheca

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Nov 21st, 2007

Re: atoi(string.substr(x,x)) Possible?

Quote ...

c Syntax (Toggle Plain Text)
atoi(dob.c_str())
atoi(dob.c_str())

That's one way to do it. I would do it like this:

c Syntax (Toggle Plain Text)
istringstream convert(dob);
int intDob =0;
convert >> intDob
istringstream convert(dob);
int intDob =0;
convert >> intDob

And voila: string dob is now saved as an int in intDob!

Last edited by Nick Evan; May 11th, 2010 at 8:42 am.

Nick Evan

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Nov 21st, 2007

Re: atoi(string.substr(x,x)) Possible?

I'm stupid, and can see how to do it,

atoi(dob.substr(2,3).c_str());

sorry everyone ! :-)

alcoheca

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Nov 21st, 2007

Re: atoi(string.substr(x,x)) Possible?

Click to Expand / Collapse Quote originally posted by niek_e ...

That's one way to do it. I would do it like this:
c Syntax (Toggle Plain Text)
istringstream convert(dob);
int intDob =0;
convert >> intDob
istringstream convert(dob); int intDob =0; convert >> intDob
And voila: string dob is now saved as an int in intDob!

I know I marked this as solved, but if I used the istringstream method, how would I then split the integer into individual ints for d, m & y?

alcoheca

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Nov 21st, 2007

Re: atoi(string.substr(x,x)) Possible?

Here's a link to the istringstream class

For your problem I'd probably use get() or ignore().

Last edited by Nick Evan; May 11th, 2010 at 8:42 am.

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