getline run-on

twiz · 03-02-2003, 05:25 AM

Hi all,
I have checked in archives but can't find any helpful posts.

It seems that I can't stop any program when the number of maximum characters in getline is exceeded. Here is a test program . . .

Code:

 

#include <iostream.h>

int main()

{
     char name[4];                   // declare cstring 3chars long + null

     cout << "\nType now :";

     cin.getline(name, 4);           // this should truncate to 3 chars 
                                               // then discard the rest.

     cout << "You typed :" << name;

     int wait;

     cin >> wait;            // should wait for int input 
                                    // irrespective of whether name > 3 or not

     return 0;

}

// THE PROBLEM: it just won't wait. If the number of characters input exceeds 3

// then program terminates while in other programs, the endless loop appears!

// SOLUTION: ???

It appears that \n stuck in the input stream, the above program just terminates and others endless loop as if repeated \n, no matter how many iterations of cin >> wait of cin.ignore().

I have tried everything I can think of including another cin.getline command, but can’t stop it if 4 characters (in this case) are input.

Additionally, I have tested and the variable ‘name’ does truncate fine to 3 characters (in this case).

Am I suffering from tunnel vision today and doing some thing fundamentally wrong?

Thanks, any help appreciated.

Stoned_Coder · 03-02-2003, 08:11 AM

add....

cin.ignore(80,'\n');

before the cin>> and after the cin.getline()

twiz · 03-02-2003, 06:25 PM

Thanks i'll give it a go . . .

**Hammer** · 03-02-2003, 06:51 PM

http://faq.cprogramming.com/cgi-bin/...&id=1043284392

twiz · 03-02-2003, 06:59 PM

Thanks Hammer,

Had seen that info but will go through it again.

I was assuming the getline would not only discard the data after max characters reached as it says it will, but would also clear the instream buffer.

I was hoping for a simple solution.

Thanks again.

03-02-2003, 05:25 AM	#1
twiz Registered User Join Date: Mar 2003 Posts: 4	getline run-on Hi all, I have checked in archives but can't find any helpful posts. It seems that I can't stop any program when the number of maximum characters in getline is exceeded. Here is a test program . . . Code: #include <iostream.h> int main() { char name[4]; // declare cstring 3chars long + null cout << "\nType now :"; cin.getline(name, 4); // this should truncate to 3 chars // then discard the rest. cout << "You typed :" << name; int wait; cin >> wait; // should wait for int input // irrespective of whether name > 3 or not return 0; } // THE PROBLEM: it just won't wait. If the number of characters input exceeds 3 // then program terminates while in other programs, the endless loop appears! // SOLUTION: ??? It appears that \n stuck in the input stream, the above program just terminates and others endless loop as if repeated \n, no matter how many iterations of cin >> wait of cin.ignore(). I have tried everything I can think of including another cin.getline command, but can’t stop it if 4 characters (in this case) are input. Additionally, I have tested and the variable ‘name’ does truncate fine to 3 characters (in this case). Am I suffering from tunnel vision today and doing some thing fundamentally wrong? Thanks, any help appreciated.
twiz is offline

03-02-2003, 08:11 AM	#2
Stoned_Coder Skunkmeister Join Date: Aug 2001 Posts: 2,572	add.... cin.ignore(80,'\n'); before the cin>> and after the cin.getline() __________________ Free the weed!! Class B to class C is not good enough!! And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi
Stoned_Coder is offline

03-02-2003, 06:25 PM	#3
twiz Registered User Join Date: Mar 2003 Posts: 4	Thanks i'll give it a go . . .
twiz is offline

03-02-2003, 06:51 PM	#4
Hammer End Of Line Join Date: Apr 2002 Posts: 6,240	http://faq.cprogramming.com/cgi-bin/...&id=1043284392 __________________ When all else fails, read the instructions. If you're posting code, use code tags: [code] /* insert code here */ [/code]
Hammer is offline

03-02-2003, 06:59 PM	#5
twiz Registered User Join Date: Mar 2003 Posts: 4	Thanks Hammer, Had seen that info but will go through it again. I was assuming the getline would not only discard the data after max characters reached as it says it will, but would also clear the instream buffer. I was hoping for a simple solution. Thanks again.
twiz is offline

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