"stdin" is treated just like a file except you dont have to create a
file decriptor, its already created. it has the type (FILE * stdin)
#include <stdio.h>
main() {
int x;
fscanf(stdin, "%d", &x);
return (x << 4);
}
At 10:48 AM 3/14/01 -0600, you wrote:
>So, how would I modify those two lines of code to allow me to do something
>like:
>echo 3 | ./bitshift
>
>I've never been able to figure out how to make a C program accept STDIN. Of
>course, I haven't spent a whole lot of time looking either.
>
>Jay
>
>> -----Original Message-----
>> From: Jason DeStefano [mailto:destef at destef.com]
>> Sent: Tuesday, March 13, 2001 8:25 PM
>> To: tclug-list at mn-linux.org
>> Subject: Re: [TCLUG] bit shifting
>>
>>
>> How about 2 lines?
>>
>> Reusable code...it makes C just as simple to crank out code as
>> scripts. It also keeps a good programmer's skills sharp by always
>> concentrating only on one language--and seperates the men from
>> the boyz when it comes to writing quility code. But for the
>> lighthearted
>> I wouldn't recommend it because power=complexity.
>>
>> #include <stdlib.h>
>> int main(int argc, char ** argv) { return (atoi(argv[1])<<4);
>> } /* x*16 */
>>
>> Now that wasnt so bad was it?
>>
>> cc -s -O3 bitshift.c
>>
>> exe size if 3.1K and is much more of an efficient OS call that running
>> a perl script. But if you prefer scripting then fair enough since for
>> software developers coding vs. scripting is somewhat of a holy
>> war.
>>
>> I'd like to see perl compilers that can compete with C--then I'd
>> be impressed.
>>
>>
>> At 07:25 AM 3/12/01 -0600, you wrote:
>> >Yes, but it's also like killing an ant with a hammer. A
>> little overkill
>> >when you're doing basic bit-shifting.
>> >
>> >Sure, C might be able to do a LOT more than C, but why do you want to
>> >write 100 lines of code when you can do it in 4?
>> >
>> >Jason DeStefano wrote:
>> >>
>> >> heh. no, i mean C. it does a LOT more than perl--and a lot
>> faster too. :)
>> >>
>> >> At 05:31 PM 3/11/01 -0600, you wrote:
>> >> >On Sun, 11 Mar 2001, Jason DeStefano wrote:
>> >> >
>> >> >> Yeah, its called "C".
>> >> >
>> >> >You mean "Perl".
>> >> >
>> >> >2.5.9 Shift Operators
>> >> >
>> >> >The bit-shift operators (<< and >>) return the value of
>> the left argument
>> >> >shifted to the left (<<) or to the right (>>) by
>> >> >the number of bits specified by the right argument. The
>> arguments should
>> >> >be integers. For example:
>> >> >
>> >> >1 << 4; # returns 16
>> >> >32 >> 4; # returns 2
>> >> >
>> >> >Andy
>> >> >
>> >_______________________________________________
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>> >https://mailman.mn-linux.org/mailman/listinfo/tclug-list
>> >
>>
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