Code of regressions functions must be in C, Compliable by clang-cl and visual c++. -- 2

- Code of regression functions must be in C, Compilable by clang-cl and visual c++.

- No third party libraries for the functions. Except for standard C libraries.

- Since its C, no exceptions thrown.

- Each function would have its own .c and .h file.

- Each function should be documented on the header (.h) file.

- Avoid inlines. Separate implementation from declaration.

- Macros are ok, as long as they are inside the c file. No macros in headers.

- Each one will have an structure that determine the inputs, outputs and parameters.

- In order to save memory space, inputs and outputs will be in floats.

- The size of the output will be the same size as the size of the input.

- While input and output is in floats, calculation should be done in doubles to minimize floating point mistakes.

- Any setting needed must be on its own structure.

- Return (int)0 on success. Error code on failure. You determine the error codes. But should be on an enumerator.

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Example header.
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#pragma once
/**
* @brief Declares simple moving average calculation.
*/

#ifdef __cplusplus
extern "C" {
#endif

/// Parameters to CalcSMA function.
struct sma_args {
unsigned int period; ///< Period of Simple moving average.
const float * input; ///< Input.
float * output; ///< Output.
unsigned count; ///< Number of items on both input and output buffer.
unsigned start; ///< Start of output.
};

/// Enumerator of possible errors for an SMA.
enum sma_error {
sma_error_none = 0, ///< No error.
sma_error_invalid_arguments, ///< Invalid arguments. passed.
sma_error_buffer_too_small, ///< Buffer is too small for calculation.
};

/**
* Calculates simple moving average.
* @param pArgs @see sma_args
* @return 0 on success. Error code on failure. @see sma_error
*/
int CalcSMA(struct sma_args * pArgs);

#ifdef __cplusplus
} extern "C"
#endif

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