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#### Exponential integral <a id="sf.cmath.expint">[[sf.cmath.expint]]</a>
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``` cpp
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double expint(double x);
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float expintf(float x);
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long double expintl(long double x);
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```
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*Effects:* These functions compute the exponential integral of their
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respective arguments `x`.
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*Returns:* $$%
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\mathsf{Ei}(x) =
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- \int_{-x}^\infty \frac{e^{-t}}
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{t } \, \mathsf{d}t
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\;$$ where x is `x`.
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