problem with a Hello World application

Reply to problem with a Hello World application on Wed, 29 Mar 2006 13:13:11 GMT

Darklink — Wed, 29 Mar 2006 13:13:11 GMT

#include 
#include 

using namespace std;

int main() {
  string name1;
  char age1;

  do {
    cout << "What is your name\n";
    getline (cin, name1 );

    cout << "What is your age?\n";
    cin >> age1;
    cin.get();

    if (age1 >= 18)
      cout << " Hi there " << name1 << ", you are allowed to enter.";
    else
      cout << "Hi there " << name1 << ", Darklink sends you his regards.";
  }
  while (!isdigit(age1));

  cout << "\nMade by Mithos Y.\n";

  cin.get();
  return 0;
}

this was originally posted by Rascar-Capac on a wrong board...
His problem was that when you enter a letter when de program asks for your age, the program quits...
for some reason this code (wich is edited by on of you guys) doesn't work well
can someone please help with this one?
greetings,
DL

Reply to problem with a Hello World application on Wed, 29 Mar 2006 13:57:42 GMT

miller_m — Wed, 29 Mar 2006 13:57:42 GMT

Darklink schrieb:

if (age1 >= 18)

you compare here ascii values

try this without the do/while loop

int age1 = 0;
// ...
cin >> age1; // if cin fails the value from age is 0
// ...

Reply to problem with a Hello World application on Thu, 30 Mar 2006 06:25:28 GMT

CStoll — Thu, 30 Mar 2006 06:25:28 GMT

and after this, you should also check and reset the state of cin to detect any errors inside the user input:

if(!cin) //an error occured
{
  cerr<<"wrong input\n";
  cin.clear(); //reset error flags - otherwise cin would ignore any future input requests
}