Why C++ for Large Scale Systems?

At cppindia.co.in, we got asked this question: “Why use C++ for Large Scale Systems?”
The talk goes through the Whys.

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Why C++ for Large Scale Systems?
Aketch  Rachel

Aketch Rachel

1620375102

Adding Coroutine Feature To C Language

Coroutine Basics

What Is Coroutine?

  • A coroutine is a function/sub-routine(co-operative sub-routine to be precise) that can be suspended and resumed.
  • In other words, you can think of coroutine as the in-between solution of normal function & thread. Because, once function/sub-routine called, it executes until the end. On the other hand, the thread can be blocked by synchronization primitives (like mutex, semaphores, etc) or suspended by the OS scheduler. But again, you can not decide on suspension & resumption on it (as it is done by the OS scheduler).
  • With coroutine, it can be suspended on a pre-defined point & resumed later on a need basis by the programmer. So here programmer will be having complete control of execution flow. That too with minimal overhead as compared to thread.
  • A coroutine is also known as native threads, fibers (in windows), lightweight threads, green threads (in java), etc.

Why Do We Need Coroutine?

As I usually do, before learning anything new, you should be asking this question to yourself. But, let me answer it:

  • Coroutines can provide a very high level of concurrency with very little overhead, as it doesn’t need OS intervention in scheduling. While in a threaded environment, you have to bear the OS scheduling overhead.
  • A coroutine can suspend on pre-determined points, so you can also avoid locking on shared data structures. Because you would never tell your code to switch to another coroutine in the middle of a critical section.
  • With the threads, each thread needs its own stack with thread local storage & other things. So your memory usage grows linearly with the number of threads you have. While with co-routines, the number of routines you have doesn’t have a direct relationship with your memory usage.
  • For most use cases, a coroutine is a more optimal choice as it is faster as compared to a thread.
  • And if you are still not convinced then wait for my C++ Coroutine post.

#software #c #system programming #c code #c and c++ #linux systems

Tamale  Moses

Tamale Moses

1624240146

How to Run C/C++ in Sublime Text?

C and C++ are the most powerful programming language in the world. Most of the super fast and complex libraries and algorithms are written in C or C++. Most powerful Kernel programs are also written in C. So, there is no way to skip it.

In programming competitions, most programmers prefer to write code in C or C++. Tourist is considered the worlds top programming contestant of all ages who write code in C++.

During programming competitions, programmers prefer to use a lightweight editor to focus on coding and algorithm designing. VimSublime Text, and Notepad++ are the most common editors for us. Apart from the competition, many software developers and professionals love to use Sublime Text just because of its flexibility.

I have discussed the steps we need to complete in this blog post before running a C/C++ code in Sublime Text. We will take the inputs from an input file and print outputs to an output file without using freopen file related functions in C/C++.

#cpp #c #c-programming #sublimetext #c++ #c/c++

Dicey Issues in C/C++

If you are familiar with C/C++then you must have come across some unusual things and if you haven’t, then you are about to. The below codes are checked twice before adding, so feel free to share this article with your friends. The following displays some of the issues:

  1. Using multiple variables in the print function
  2. Comparing Signed integer with unsigned integer
  3. Putting a semicolon at the end of the loop statement
  4. C preprocessor doesn’t need a semicolon
  5. Size of the string matters
  6. Macros and equations aren’t good friends
  7. Never compare Floating data type with double data type
  8. Arrays have a boundary
  9. Character constants are different from string literals
  10. Difference between single(=) and double(==) equal signs.

The below code generates no error since a print function can take any number of inputs but creates a mismatch with the variables. The print function is used to display characters, strings, integers, float, octal, and hexadecimal values onto the output screen. The format specifier is used to display the value of a variable.

  1. %d indicates Integer Format Specifier
  2. %f indicates Float Format Specifier
  3. %c indicates Character Format Specifier
  4. %s indicates String Format Specifier
  5. %u indicates Unsigned Integer Format Specifier
  6. %ld indicates Long Int Format Specifier

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A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a non-negative integer in the range [0 to 4294967295]. The signed integer is represented in twos-complement notation. In the below code the signed integer will be converted to the maximum unsigned integer then compared with the unsigned integer.

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#problems-with-c #dicey-issues-in-c #c-programming #c++ #c #cplusplus

Ruth  Nabimanya

Ruth Nabimanya

1620633584

System Databases in SQL Server

Introduction

In SSMS, we many of may noticed System Databases under the Database Folder. But how many of us knows its purpose?. In this article lets discuss about the System Databases in SQL Server.

System Database

Fig. 1 System Databases

There are five system databases, these databases are created while installing SQL Server.

  • Master
  • Model
  • MSDB
  • Tempdb
  • Resource
Master
  • This database contains all the System level Information in SQL Server. The Information in form of Meta data.
  • Because of this master database, we are able to access the SQL Server (On premise SQL Server)
Model
  • This database is used as a template for new databases.
  • Whenever a new database is created, initially a copy of model database is what created as new database.
MSDB
  • This database is where a service called SQL Server Agent stores its data.
  • SQL server Agent is in charge of automation, which includes entities such as jobs, schedules, and alerts.
TempDB
  • The Tempdb is where SQL Server stores temporary data such as work tables, sort space, row versioning information and etc.
  • User can create their own version of temporary tables and those are stored in Tempdb.
  • But this database is destroyed and recreated every time when we restart the instance of SQL Server.
Resource
  • The resource database is a hidden, read only database that holds the definitions of all system objects.
  • When we query system object in a database, they appear to reside in the sys schema of the local database, but in actually their definitions reside in the resource db.

#sql server #master system database #model system database #msdb system database #sql server system databases #ssms #system database #system databases in sql server #tempdb system database

Ari  Bogisich

Ari Bogisich

1589816580

Using isdigit() in C/C++

In this article, we’ll take a look at using the isdigit() function in C/C++. This is a very simple way to check if any value is a digit or not. Let’s look at how to use this function, using some simple examples.

#c programming #c++ #c #c#