How to program in C on FreeDOS

When I first started using DOS, I enjoyed writing games and other interesting programs using BASIC, which DOS included. Much later, I learned the C programming language.

I immediately loved working in C! It was a straightforward programming language that gave me a ton of flexibility for writing useful programs. In fact, much of the FreeDOS core utilities are written in C and Assembly.

So it’s probably not surprising that FreeDOS 1.3 RC4 includes a C compiler—along with other programming languages. The FreeDOS 1.3 RC4 LiveCD includes two C compilers—Bruce’s C compiler (a simple C compiler) and the OpenWatcom C compiler. On the Bonus CD, you can also find DJGPP (a 32-bit C compiler based on GNU GCC) and the IA-16 port of GCC (requires a '386 or better CPU to compile, but the generated programs can run on low-end systems).Programming in C on FreeDOS is basically the same as C programming on Linux, with two exceptions:

1. You need to remain aware of how much memory you use. Linux allows programs to use lots of memory, but FreeDOS is more limited. Thus, DOS programs used one of four memory models (large, medium, compact, and small) depending on how much memory they needed.
2. You can directly access the console. On Linux, you can create text-mode mode programs that draw to the terminal screen using a library like ncurses. But DOS allows programs to access the console and video hardware. This provides a great deal of flexibility in writing more interesting programs.

I like to write my C programs in the IA-16 port of GCC, or OpenWatcom, depending on what program I am working on. The OpenWatcom C compiler is easier to install since it’s only a single package. That’s why we provide OpenWatcom on the FreeDOS LiveCD, so you can install it automatically if you choose to do a “Full installation including applications and games” when you install FreeDOS 1.3 RC4. If you opted to install a “Plain DOS system,” then you’ll need to install the OpenWatcom C compiler afterward, using the FDIMPLES package manager.

#freedos #c #program #c on freedos

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Learning C: Input and Output and Two Program Templates

Before I get too deep into C, I need to show you how to get data into and out of your programs. Using assignment for data gets old after a while and you want to be able to have users enter their own data. And you definitely need to be able to see what happens to your data in a program so learning how to display data to the screen is important and necessary.

Besides demonstrating how to perform input and output in C, I will also be demonstrating two templates that are related to those topics — Prompt, Then Read and Input, Process, Output (IPO). The IPO template, in particular, is important because practically every C program you write will use this template.

When I talk about input and output in C, I’ll use the terms standard input and standard output. These terms refer to the default input and output devices on your computer. The standard input device is the keyboard. The standard output device is the computer’s monitor or screen. I will only use the terms input and output and when I use those terms I’m referring to standard input and standard output. If I want to refer to a different device for input and/or output, I’ll use the specific term for that device.

#c-programming-language #c-programming #c-program #c-programming-help

How to program in C on FreeDOS

When I first started using DOS, I enjoyed writing games and other interesting programs using BASIC, which DOS included. Much later, I learned the C programming language.

I immediately loved working in C! It was a straightforward programming language that gave me a ton of flexibility for writing useful programs. In fact, much of the FreeDOS core utilities are written in C and Assembly.

So it’s probably not surprising that FreeDOS 1.3 RC4 includes a C compiler—along with other programming languages. The FreeDOS 1.3 RC4 LiveCD includes two C compilers—Bruce’s C compiler (a simple C compiler) and the OpenWatcom C compiler. On the Bonus CD, you can also find DJGPP (a 32-bit C compiler based on GNU GCC) and the IA-16 port of GCC (requires a '386 or better CPU to compile, but the generated programs can run on low-end systems).Programming in C on FreeDOS is basically the same as C programming on Linux, with two exceptions:

1. You need to remain aware of how much memory you use. Linux allows programs to use lots of memory, but FreeDOS is more limited. Thus, DOS programs used one of four memory models (large, medium, compact, and small) depending on how much memory they needed.
2. You can directly access the console. On Linux, you can create text-mode mode programs that draw to the terminal screen using a library like ncurses. But DOS allows programs to access the console and video hardware. This provides a great deal of flexibility in writing more interesting programs.

I like to write my C programs in the IA-16 port of GCC, or OpenWatcom, depending on what program I am working on. The OpenWatcom C compiler is easier to install since it’s only a single package. That’s why we provide OpenWatcom on the FreeDOS LiveCD, so you can install it automatically if you choose to do a “Full installation including applications and games” when you install FreeDOS 1.3 RC4. If you opted to install a “Plain DOS system,” then you’ll need to install the OpenWatcom C compiler afterward, using the FDIMPLES package manager.

#freedos #c #program #c on freedos

WASI Development Toolchain for C/C++

We realized that compiling already existing C/C++ projects to WASI was much more challenging than we expected. This is because of two main reasons:

1. It’s not trivial to install and use the WASI SDK
2. It’s quite hard to port existing projects to WASI as it requires a tighter integration with all configuration and make tools

Inspired by these challenges we have been working non-stop on improving the tooling so it’s easier for anyone to use and adopt WebAssembly and WASI!

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

C programming for Beginners | Learn C Programming | C Language

C Language is an evergreen language and is used widely across different industries, This C programming is a must for students and working professionals to become a great Software Engineer especially when they are working in Software Development Domain. Great Learning brings you this live session on “Introduction to C”. In this live session, we will be covering major concepts in C Programming such as Different Variables, Different Data Types that are being used, its Operators, Flow control statements, Structure, and lot more.

#c #programming #developer #c-programming #c-language

Object Oriented Programming in C++ | C++ OOPs Concepts | Learn Object Oriented C++

C++ is general purpose, compiled, object-oriented programming language and its concepts served as the basis for several other languages such as Java, Python, Ruby, Perl etc.

The goal of this course is to provide you with a working knowledge of C++. We’ll start with the basics, including syntax, operators, loops, and functions. This Course will explain you how to use data structures and create your own Functions. This Course will show you the details of the powerful object and template systems so you can create useful classes and objects.

Youtube channel: ProgrammingKnowledge - https://www.youtube.com/watch?v=_SH1T3y_D7o

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