Re: correct way to use getchar function?
- From: prateek aggarwal <prateekagarwal99@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Fri, 15 Apr 2011 13:20:31 +0530
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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