Difference between revisions of "C programming notes"

Revision as of 23:47, 9 June 2022

Really good interesting article by Simon Tatham on co-routines and a couple ways of implementing them in C language; accessible good style of writing:

• https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html

Quote from the article:

"Any coding standard which insists on syntactic clarity at the expense of algorithmic clarity should be rewritten."  - Simon Tatham

Floating point convert and notes on-line, Javascript converter:

• https://www.h-schmidt.net/FloatConverter/IEEE754.html

^ C Pointers and dereference syntax

This section the beginning of references, links and personal notes on some of the most difficult and important C language constructs, often used in schedulers and RTOS implementations:

• https://riptutorial.com/c/example/31818/typedef-for-function-pointers

Arrays of strings and arrays of pointers to strings:

• https://stackoverflow.com/questions/1088622/how-do-i-create-an-array-of-strings-in-c/1095006

^ Simple C examples

Program 1 - use of C comma operator, a binary operator:

#include <stdio.h>
#include <stdlib.h>



// Compile with:
//
//    $ gcc -Wall main.c
//
// As of 2022-06-09 Builds with 'gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0'




int main(int argc, char *argv[])
{
    int z = 3;

    int y[(z++, (z + 1))];


    y[0] = 1;

    if ( z == y[0] ) { } 

#define SIZE_OF_160_BYTES (160)
    char lbuf[SIZE_OF_160_BYTES] = { 0 };
    snprintf(lbuf, SIZE_OF_160_BYTES, "2022-06-09 main.c test of C comma operator\narray y[] has size of %lu\n",
      sizeof(y));
    printf("%s", lbuf);


    return 0;
}

^ References

• https://en.wikipedia.org/wiki/Duff%27s_device

• https://en.wikipedia.org/wiki/Comma_operator