Write Great Code, VOL 2

Thinking Low Level

Today's programming languages offer productivity and portability, but also make it easy to write sloppy code that isn't optimized for a compiler. Thinking Low-Level, Writing High-Level will teach you to craft source code that results in good machine code once it's run through a compiler.
You'll learn:
• How to analyze the output of a compiler to verify that your code generates good machine code
• The types of machine code statements that compilers generate for common control structures, so you can choose the best statements when writing HLL code
• Enough assembly language to read compiler output
• How compilers convert various constant and variable objects into machine data
With an understanding of how compilers work, you'll be able to write source code that they can translate into elegant machine code.
NEW TO THIS EDITION, COVERAGE OF:
• Programming languages like Swift and Java
• Code generation on modern 64-bit CPUs

PowerShell for Sysadmins: Workflow Automation Made Easy

You'll learn how to:
• Combine commands, control flow, handle errors, write noscripts, run noscripts remotely, and test noscripts with the PowerShell testing framework, Pester
• Parse structured data like XML and JSON, work with common domains (like Active Directory, Azure, and Amazon Web Services), and create a real-world server inventory noscript
• Design and build a PowerShell module to demonstrate PowerShell isn't just about ad-hoc noscripts
• Use PowerShell to create a hands-off, completely automated Windows deployment
• Build an entire Active Directory forest from nothing but a Hyper-V host and a few ISO files
• Create endless Web and SQL servers with just a few lines of code!

- Why should we use functions ?
- What are examples of functions in real-world  ?
- How to declare and define functions ?
- Implemented Strlen function in C.

داخل این ویدیو درمورد فانکشن ها صحبت کردم.
چجوری فانکشن هارو تعریف کنیم. استفاده کنیم.
درمورد فانکشن ها داخل دنیای واقعی صحبت کردم.
فانکشن strlen رو خودمون نوشتیم که ببینیم چجوری داره کار میکنه
و چجوری یک فانکشن نوشته میشه و به کار میاد

Our Telegram Channel | Kernel Kudos

It had a Zilog Z-80 processor. With 1K of memory for the screen (character display) and another 1K for use by programs.
There was no room for a compiler or an assembler. So to create a program, you entered opcodes into the memory as hexadecimal numbers.
So, for example, if your program started with loading the A register with the number 3. - You might think of this as the assembly instruction:
LD A,3
But then you would need to look-up the opcode in a book (or memorise it). And type in
3E 03
I wrote a few programs on it. A version of Game of Life - And a simple side-scrolling shooter. (where the graphics were various alphabetic characters).
There was no bin file, or files of any kind, because there was no operating system to interpret such a file. There was the ability to dump a block of memory directly to a tape. And this is how programs were saved and loaded.

int i = 0;
while (arr[i] != '\0') {
    i++;
}
return i;

#define RET_OK 0
#define RET_NOK 1

int add (int a, int b) {
    return a + b;
}

int main() {
    int s = 43;

    int (*func_ptr)(int, int) = add;
    int res = func_ptr(s, ++s);
    printf("%i\n", res);
    return RET_OK;
}