Fresnel integrals C(x) and S(x) are defined as and .

Some sources don't use multiplier before t ² (in this case, the integral is multiplied by the scaling coefficient), so you should watch closely what integral is being referred to.

FresnelIntegral subroutine calculates C(x) and S(x) using piecewise rational approximation.

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C#

C# 1.0 source.
fresnel.csharp.zip - Fresnel integrals C(x) and S(x)

C++

C++ source.
fresnel.cpp.zip - Fresnel integrals C(x) and S(x)
ablas.zip - optimized basic linear algebra subroutines with SSE2 support (for C++ sources only)

Delphi

Delphi source.
Can be compiled under FPC (in Delphi compatibility mode).
fresnel.delphi.zip - Fresnel integrals C(x) and S(x)

Visual Basic 6

Visual Basic 6 source.
fresnel.vb6.zip - Fresnel integrals C(x) and S(x)

Zonnon ^beta

Zonnon source.
Zonnon is an experimental language developed at ETH Zurich.
See www.zonnon.ethz.ch for more information.
fresnel.zonnon.zip - Fresnel integrals C(x) and S(x)