29
Numerics library
[numerics]
29.9
Mathematical functions for floating-point types
[c.math]
29.9.5
Mathematical special functions
[sf.cmath]
29.9.5.14
Exponential integral
[sf.cmath.expint]
double expint(double x); float expintf(float x); long double expintl(long double x);
1
#
Effects:
These functions compute the exponential integral of their respective arguments
x
.
2
#
Returns:
where
x
is
x
.