question about for loop

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C++

Can we use for loop when we want user can not enter negative value

we want to restrict user to enter negative values

Posted 10-May-12 2:50am

ALIWAZ

Updated 10-May-12 2:55am

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Prasad_Kulkarni 10-May-12 8:51am

For me: Question is not clear Aliwaz, please elaborate.

nagendrathecoder 10-May-12 8:57am

Please explain a bit, give some code snippet if you can.

Sandeep Mewara 10-May-12 8:58am

This is not a well framed question! We cannot work out what you are trying to do/ask from the post. Please elaborate and be specific.
Use the "Improve question" link to edit your question and provide better information.

CPallini 10-May-12 9:04am

for provides the iteration facility. What has it to do with user input validation?

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Eugen Podsypalnikov · Answer 1 · 2012-05-10T03:52:00

Solution 2

The Manfred's solution :) :

C++

void WaitForPositiveInput(int& iValue)
{
  enum { eInitValue = -1, eMinValue = 0 };
  iValue = eInitValue;

  for (cin >> iValue; iValue < eMinValue; cin >> iValue);
}

Posted 10-May-12 3:52am

Eugen Podsypalnikov

Manfred Rudolf Bihy · Answer 2 · 2012-05-10T03:27:00

Solution 1

Yes of course you can, not that it would make much sense though. You could use a for loop to loop until a non-negative number was input and then break out of the loop. Only the question would be why, why, why?

Regards,

Manfred

Posted 10-May-12 3:27am

Manfred Rudolf Bihy

Comments

CPallini 10-May-12 9:34am

He could also increase the original input in the for loop until he gets a positive number...
:-)

Manfred Rudolf Bihy 10-May-12 9:52am

Which would make the input always 1 (or zero whatever) if a negative number was input, thus eliminating the need for the loop. Still a neat idea to burn some CPU cycles. ;)

CPallini 10-May-12 10:36am

No one said 'increment' would be '+1'.