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

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Join Date: Nov 2007

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alcoheca

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

Nov 21st, 2007

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?

 Help with Code Tags 
 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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Join Date: Oct 2006

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niek_e

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

Nov 21st, 2007

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Help with Code Tags

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:

 Help with Code Tags 
 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!

Regards Niek

Last edited by niek_e; Nov 21st, 2007 at 8:12 am.

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Join Date: Nov 2007

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alcoheca

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

Nov 21st, 2007

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

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

sorry everyone ! :-)

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Join Date: Nov 2007

Posts: 26

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alcoheca

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

Nov 21st, 2007

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Originally Posted by niek_e

That's one way to do it. I would do it like this:
Help with Code Tags

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?