29 Numerics library [numerics]

29.7 Mathematical functions for floating-point types [c.math]

29.7.6 Mathematical special functions [sf.cmath]

29.7.6.15 Exponential integral [sf.cmath.expint]

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floating-point-type expint(floating-point-type x); float expintf(float x); long double expintl(long double x);
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Effects: These functions compute the exponential integral of their respective arguments x.
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Returns: Ei(x), where Ei is given by Formula 29.35 and x is x.