Write a haskell program. Expert's Help, Write a haskell program Discussions Write discussion on Write a haskell program Your posts are moderated. Haskell/Getting set up - Wikibooks, open books for an open world. This chapter describes how to install the programs you'll need to start coding in Haskell. Installing Haskell. It's like writing a cooking recipe: you write the recipe and the computer executes it. To use Haskell programs, you need a special program called a Haskell compiler. A compiler takes code written in Haskell and translates it into machine code, a more primitive language that the computer understands. Using the cooking analogy, you write a recipe (your Haskell program) and a cook (a compiler program) does the work of putting together actual ingredients into an edible dish (an executable file). Of course, you can't easily get the recipe from a final dish (and you can't get the Haskell program code from executable after it's compiled). To get started, see haskell. The instructions here in the Wikibook assume the full GHC install, but some of the basics can work in the website version. Note. UNIX users: If you are a person who prefers to compile from source: This might be a bad idea with GHC, especially if it's the first time you install it. GHC is itself mostly written in Haskell, so trying to bootstrap it by hand from source is very tricky. Besides, the build takes a very long time and consumes a lot of disk space. If you are sure that you want to build GHC from the source, see Building and Porting GHC at the GHC homepage. First code. Depending on your operating system, perform the following steps: On Windows: Click Start, then Run, then type 'cmd' and hit Enter, then type ghci and hit Enter once more. On Mac. OS: Open the application ? It then informs you that it's loading the base package, so you'll have access to most of the built- in functions and modules that come with GHC. Finally, the Prelude> bit is known as the prompt. This is where you enter commands, and GHCi will respond with their results. Now let's try some basic arithmetic. Prelude> 2 + 2. Prelude> 5 + 4 * 3. Prelude> 2 ^ 5. These operators match most other programming languages: + is addition, * is multiplication, and ^ is exponentiation (raising to the power of, or ab. As shown in the second example, Haskell follows standard order of math operations (e. Actually, Haskell is always a calculator . As we progress, we will learn how to load files with source code into GHCi and evaluate different parts of them. Assuming you're clear on everything so far (if not, use the talk page and help us improve this Wikibook!), then you are ready for next chapter where we will introduce some of the basic concepts of Haskell and make our first Haskell functions.
Systems Programming in Haskell. Haskell's forkProcess function.
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