Re: correct way to use getchar function?
- From: ashish rohtagi <ashishrohtagi1969@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Sat, 16 Apr 2011 06:16:41 +0530
hi Jackie, no I am not running the programs in command line, if you
can remember that keystroke that will be great. thanks. take care,
regards. ashish
On 4/15/11, Jackie McBride <abletec@xxxxxxxxx> wrote:
> Ashish, r u runnin your program in command line, e.g., go to your
> start menu, thence to run, (windows key r) then type cmd & press
> enter, then cd to where your program lives & type your program's name?
> That will make the output stay onscreen & render getchar()
> unnecessary. I think there's also a keystroke in dev-c++ to make that
> happen, but I can't remember now precisely what it is. I think I just
> used to do what I said above.
>
> Glad u clarified for us what you're using as a compiler & also that u
> weren't in fact getting compiler errors. It helps when u do that,
> because then we know what we're dealing with. Keep that up. You'll get
> lots better & lots more timely answers when u tell us these things,
> because otherwise, as I did, we mistake what you're saying & go off on
> some irrelevant tangent.
>
> Have fun w/your programming adventures.
>
> On 4/15/11, ashish rohtagi <ashishrohtagi1969@xxxxxxxxx> wrote:
>> hi Prateek, thanks for the explanation. but I do not deserve the
>> praise about that site. anyway you are now a successful software
>> developer, web designer and seo expirt. you have made your place, and
>> I wish you good luck for future. this list is full of successful
>> programmers, and I am really glad to see you here. take care, regards.
>> ashish
>>
>> On 4/15/11, prateek aggarwal <prateekagarwal99@xxxxxxxxx> wrote:
>>> Respected ashish sir,
>>> Its privilege finding you here.
>>> For the benefit of list mates, I’d like to inform that ashish sir is
>>> one of the pioneers in blind community who have started developing
>>> community specific portals.
>>> His portal about blindness related information has been a great hit in
>>> India, and we all miss that now as he had to shut the same for some
>>> reasons.
>>>
>>> I’d like to openly confess that ashish sir is one of my inspirational
>>> icons.
>>> Coming on the answer now:
>>>
>>> Sir, As you know, the function getchar() is used to get or read the
>>> input (i.e a single character) at run time. Certainly it solves the
>>> concern where you want the program to wait for your input.
>>> To give you a clear picture, let me try to show you a few examples I
>>> could come up with:
>>>
>>> Example 1:
>>>
>>>
>>> void main()
>>> {
>>> char ch;
>>> ch = getchar();
>>> printf("Input Char Is :%c",ch);
>>> }
>>>
>>> programme explaination:
>>> Here,declare the variable ch as char data type, and then get a value
>>> through getchar() library function and store it in the variable ch.And
>>> then,print
>>> the value of variable ch.
>>> During the program execution, a single character is get or read
>>> through the getchar(). The given value is displayed on the screen and
>>> the compiler wait
>>> for another character to be typed. If you press the enter key/any
>>> other characters and then only the given character is printed through
>>> the printf function.
>>>
>>> Example 2:
>>>
>>>
>>> #include <stdio.h>
>>>
>>> main()
>>> {
>>> int i;
>>> int ch;
>>>
>>> for( i = 1; i<= 5; ++i ) {
>>> ch = getchar();
>>> putchar(ch);
>>> }
>>> }
>>>
>>> Program explaination:
>>> The program reads five characters (one for each iteration of the for
>>> loop) from the keyboard. Note that getchar() gets a single character
>>> from the keyboard, and putchar() writes a single character (in this
>>> case, ch) to the console screen.
>>>
>>> For understanding it better, here is an example of a simple
>>> typewriter, where Every sentence is echoed, once ENTER has been
>>> pressed until a dot (.) is included in the text.
>>>
>>> Example 3:
>>>
>>> #include <stdio.h>
>>>
>>> int main ()
>>> {
>>> char c;
>>> puts ("Enter text. Include a dot ('.') in a sentence to exit:");
>>> do {
>>> c=getchar();
>>> putchar (c);
>>> } while (c != '.');
>>> return 0;
>>> }
>>>
>>> in case you are well versed with case statement, I’d like to write
>>> another example that might help you developing an even better
>>> understanding.
>>>
>>> Please checkout here this example program on how to ask the user with
>>> getchar.
>>>
>>> Example 4:
>>>
>>> #include <stdio.h>
>>>
>>> int main() {
>>> int retry;
>>> int key;
>>>
>>> do {
>>> retry = 0;
>>> printf("Shall I say hello (y/n)? ");
>>> key = getchar();
>>> switch(key) {
>>> case 'y':
>>> printf("Hello!\n");
>>> break;
>>> case 'n':
>>> break;
>>> default:
>>> retry = 1;
>>> printf("Please enter y or n!\n");
>>> }
>>> } while(retry == 1);
>>>
>>> return 0;
>>> }
>>>
>>> kindly revert in case you want any further explaination on this.
>>> Hope it helped somewhat.
>>>
>>> Regards,
>>> Prateek agarwal.
>>> Director,
>>> Daedal technovations pvt. Ltd.
>>> www.daedaltechnovations.com
>>>
>>>
>>>
>>> On 4/15/11, ashish rohtagi <ashishrohtagi1969@xxxxxxxxx> wrote:
>>>> hi Chris, that worked. I am using bloodshed as suggested by some
>>>> members of this list. and Jackie, I already said that the code was
>>>> compiling but the last message was not staying on screen. Chriss
>>>> solved this problem. thanks alot. Chriss or anyone else will you
>>>> please tell me why it happened? and should I use getchar in this way
>>>> always? take care, regards. ashish
>>>>
>>>> On 4/15/11, QuentinC <quentinc@xxxxxxxxxxx> wrote:
>>>>> Jackie McBride wrote : It is a good idea to flush stdin.
>>>>> Never flush stdin, it is an undefined behavior
>>>>>
>>>>>
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>>>
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>>
>
>
> --
> Blame the computer--why not? It can't defend itself & occasionally
> might even be the culprit
> Jackie McBride
> Jaws Scripting training materials:
> www.screenreaderscripting.com
> homePage: www.abletec.serverheaven.net
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> View the list's information and change your settings at
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