C++ v C# - Key Differences and When to Use Them

Learning a programming language is no small task, so it’s only right to spend some time considering which one will work best for you. One common comparison is between C++ and C#. With roots in the general purpose C programming language, both share some similarities, especially in the syntax. However, they are fundamentally different languages with their own strengths and weaknesses.

Here we’ll take a closer look at these two languages, including the main differences between them and when they should be used.

An introduction to C++ and C#

What is C++? The C++ language was developed by Danish computer scientist  Bjarne Stroustrup in the 1980s. His goal was to create a language that supported object-oriented programming based on C. C++ was designed to be less complex and more reusable, making development more efficient. The language has been upgraded and improved several times since its origins, with the latest iteration (C++20) published in December 2020. It has been mainly used for game programming, software engineering, data structures, developing browsers, operating systems, and applications.

What is C#? C# (known as ‘C-sharp’) is a younger variation, developed in 2002 by Microsoft as a fully object-oriented programming language for the .NET platform. It quickly became popular on the Windows operating system and was later adapted to run on other platforms. Over the last two decades, C# has evolved with additional features to support new workloads and emerging software design practices. It’s one of the most widely used languages today for the construction of web-based applications, desktop apps, games, and interactive software.

Key differences between C++ and C#

As we mentioned earlier, there are some similarities between C++ and C#. Both languages are object-oriented meaning you can write code that is modular, flexible, and reusable. They are both based on C, so the code looks broadly similar at first glance - both use the concepts of classes, inheritance and polymorphism. Moreover, both C++ and C# are compiled languages, meaning the code must be converted before they can be executed on a computer (an .EXE file is a typical example of a compiled file that could be written in C++ or C#).

However, despite some surface-level similarities there are key differences in the two languages. Here are some of the most important distinctions:

  • High-level vs low level: C# is a high-level programming language. This means it is typically more user-friendly as it is more readable for humans, but often cannot be directly interpreted by computers. By contrast, low-level languages like binary format are easily understood by machines. C++ is considered to be mid-level: it is built directly on C, a lower-level language, but contains elements of high-level language.

  • Compilation: Though we stated that both C++ and C# are both compiled languages, the way this is achieved is different. C++ is compiled into machine binary code immediately, whereas C# code converts to Common Language Runtime (CLR) on compilation and then interpreted by .NET to create native code. This implies C++ has a runtime and performance advantage, as C# has a lot of overhead and libraries included before it will compile.

  • Binary size: Following on from this point, C++ is much more lightweight than C#, which has a lot of overhead and libraries included before it will compile. As a result, C# binaries are much larger after compilation compared to C++.

  • Memory management: In the original C language, memory is allocated and deallocated manually by programmers. C++ included some features to automate memory management, but overall it remains a manual task and is therefore prone to memory leaks due to human error. C# runs on a virtual machine and uses garbage collection to automatically deallocate memory that is no longer used. This is typically considered a benefit, though there may be some instances where the garbage collector is unable to deallocate certain objects.

  • Compiler warnings: With C++ a programmer can write almost any code provided the syntax is right, while C# immediately alerts coders about any errors that may cause damage. This makes C++ a more flexible language, but unidentified bugs can cause serious problems down the line.

Should you use C# or C++ for your project?

As ever, the short answer to this type of question is: “it depends”. According to the latest Stack Overflow developer survey, C is the more popular language with 29.8% using it vs 19.9% for C++. However, as we’ve seen, there are key differences to the two languages, so rather than just picking a favorite it’s useful to consider which would be most suitable for each project.


  • When you might use C++: Some of the key benefits of C++ include its speed, efficiency and versatility. It can be used to build fast standalone server-side applications and complex video games, and is platform independent. It is also needed for low-level processing, when you require direct interaction with hardware and better performance requirements (e.g. with IoT devices). C++ is a more complex language and so considered more difficult to learn. However, its long history and widespread use among almost all of the world’s major operating systems means it’s always useful to understand C++.

  • When you might use C#: This language is commonly used for building modern web and desktop applications, which are coded at a higher level. It is also popular for video games. It has an expansive code library and a vibrant community, which is useful for inexperienced programmers. C# is not technically as flexible or fast as C++, but once you factor in that it is easier to learn and allows for quicker development times, the overall difference in efficiency may not be so significant. 


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