Re: correct way to use getchar function?
- From: Jackie McBride <abletec@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Fri, 15 Apr 2011 07:45:29 -0700
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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>
--
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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