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Hi,
I have new to C++ programming. I would like to know how to define or limit the cin function so that it would only accept integer or text rather than anything.
I like to use the if statement and close the program if the user enters an invalid integer or text. For example:
if (blah != integer)
....blah...;
I have tried replacing "integer" with "int." That does not work. Is there anything I use put inplace of "integer" that would set it to either integer or text only? Thanks.
Kuphryn
Hi there,
What you want, in the way you are doing it, is not possible - you basically have to take input as a string and then throw an error back to the user if any of the characters are not numeric.
The basic C++ objects such as istream and ostream (of which cin and cout are derivative) suck. All I can suggest is use someone else's functions that ignore non-numeric keypresses, or write your own routine to capture keyboard input. This is the sort of thing Java has standardised and made work well.
I've never used cin/cout since exercises I had to do for my degree. Standardisation of C++ is basically really badly done.
I think I know what is going on. I can just define the object as a string or an integer. That way, I can use if for other purposes like specific integers.
Kuphryn
That's funny because I've always thought console IO in java is more of a pain then in C++. And how do you take an input in Java that ignores non-numeric keyppresses? I'm aware of no such thing (but then I never really got into Java)
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Keep it brief
[This message has been edited by dighn (edited September 17, 2001).]
Yeh, IO is a little trickier, but there are standardised ways to bypass it. I could give code that would work in C++ but it would be platform specific (DOS, Win32, MFC, as a custom control). In Java I could give _1_ piece of source and say "use (so and so) class to capture the input of each key"Quote:
Originally posted by dighn:
That's funny because I've always thought console IO in java is more of a pain then in C++. And how do you take an input in Java that ignores non-numeric keyppresses? I'm aware of no such thing (but then I never really got into Java)
That's what I was getting at
Would you mind telling me how? It sounds interesting https://www.sharkyforums.com/images/.../2005/06/5.gifQuote:
Originally posted by brianshields:
Yeh, IO is a little trickier, but there are standardised ways to bypass it. I could give code that would work in C++ but it would be platform specific (DOS, Win32, MFC, as a custom control). In Java I could give _1_ piece of source and say "use (so and so) class to capture the input of each key"
That's what I was getting at
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Keep it brief