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I'm working with a microcontroller at the moment that has a single
instruction for clearing a bit in a byte.

I started off with the following line of code:

x &= ~0x8u; /* Clear the 4th bit */

But then I changed it to the following because I thought I might get
more efficient assembler out of it:

x &= 0xF7u; /* Clear the 4th bit */

Suprisingly, the compiler produced more efficient code for the latter,
presumably because it recognises the pattern of " x &= ~y" for
clearing a single bit.

Anyway just thought I'd give an example of someone winding up with
less efficient code when their aim was to make the code more
efficient :-D

I have looked this program up and down and I don't see what's wrong with
it. But it always breaks and gives me an error "mode error" no matter which
mode binary or text I choose. This simple program is supposed to take as
argv[1] a "b" or "t" for binary or text. It's not taking anything.

#include

I've been trying to use _kbhit() but it didn't do what I thought it
would from books, "Detects whether a keypress is available for reading."

Herbert Schildt says,
"If the user has pressed a key, this function returns
true(non-0), but does not read the character.
If no keystroke is pending, kbhit() returns false (0)."

Here is the test code,

#include
void main(void) {
int ig1=0, ig2=0, ik=-1;
ig1 = _getch();
ik = _kbhit();
ig2 = _getch();
_getch();
printf("ig1=%%d, ik=%%d, ig2=%%d", ig1,ik,ig2);
return;
}

Hello

What is the best IDE to use for C/C++ languages?
Previously I used "turbo c" compiler on Windows XP.

But now I switched to Windows Vista where I cant use it. I tried to
setup CDT eclipse but could not compile C program.

Can somebody please tell me which IDE is best and from where to
download?

Thanks

Please Help

Kapil Kumar

Let's say we had a simple function for returning the amount of days in
a month:

unsigned DaysInMonth(unsigned const month)
{
switch (month)
{
case 8:
case 3:
case 5:
case 10: return 30;

case 1: return 28;

default: return 31;
}
}

Notice the integer type I've used, i.e. "unsigned int" rather than
"unsigned char" or "unsigned short".

Many of the microcontrollers (i.e. a small chip that has a CPU and
RAM, basically it's a tiny little computer) in use nowadays do
arithmetic on 8-Bit numbers.

Clik http://kg-azfari.myminicity.com

Hi everyone,

I'm trying to reliably store and read back an int (or short) into/from
a character array. How does one do this in C? I've thought about using
bit shifting and the like in order to put one char at a time, but this
doesn't seem right. Is there something I'm missing? If it's any help,
I'm trying to build a char array to send through a socket.

Thanks,
Vlad

In python, I could write:

a = 1

if a in [1, 2]:
do something...

In c (and many other languages):

int a = 1;

if (a == 1 || a == 2) {
do something...
}

Is there a shorter, cleaner syntax?

PURPOSE: see the comments.
WHAT I GOT: infinite loop

/* This program will simply create an array of pointers to integers
* and will fill it with some values while using malloc to create
* pointers to fill the array and then will print the values pointed
* by those pointers
*
*/

#include
#include

enum MAXSIZE { ARRSIZE = 100 };

int main( void )
{
int* arr_p[ARRSIZE];
int** pp;
int *mp, *np;
int i;

int null_int = 0;