Philip Müller wrote:

Is there a way to write some of the functions in Haskell and then use them in my C code via some kind of interface?

The beast you are looking for is called the FFI: Foreign Function Interface. C doesn't make IO any easier, though. More verbose and low-level, I would say. -- (c) this sig last receiving data processing entity. Inspect headers for past copyright information. All rights reserved. Unauthorised copying, hiring, renting, public performance and/or broadcasting of this signature prohibited.

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Is there a way to write some of the functions in Haskell and then use them in my C code via some kind of interface?

Using C just for IO is a bit weird -- perhaps you could illustrate the kind of IO you're doing? Learning how to do IO in Haskell is a much safer solution that linking the Haskell runtime into your C program. That said, this is done by using 'foreign export' declarations in your Haskell code, then linking the compiled Haskell objects into your C code, as follows: We define the fibonacci function in Haskell: {-# LANGUAGE ForeignFunctionInterface #-} module Safe where import Foreign.C.Types fibonacci :: Int -> Int fibonacci n = fibs !! n where fibs = 0 : 1 : zipWith (+) fibs (tail fibs) fibonacci_hs :: CInt -> CInt fibonacci_hs = fromIntegral . fibonacci . fromIntegral foreign export ccall fibonacci_hs :: CInt -> CInt And call it from C: #include "A_stub.h" #include int main(int argc, char *argv[]) { int i; hs_init(&argc, &argv); i = fibonacci_hs(42); printf("Fibonacci: %d\n", i); hs_exit(); return 0; } Now, first compile the Haskell file: $ ghc -c -O A.hs Which creates some *.c and *.h headers, which you import into your C program. Now compile your C code with ghc (!), passing the Haskell objects on the command line: $ ghc -optc-O test.c A.o A_stub.o -o test How run your C code: $ ./test Fibonacci: 267914296 And that's it. -- Don P.S. Its easier to learn how to do IO in Haskell :)