zsh命令行数值计算

在zsh里

$ zmodload zsh/mathfunc
$ echo $(( sin(1/4.0)**2 + cos(1/4.0)**2 - 1 ))
-1.1102230246251565e-16
$ echo $(( pi = 4.0 * atan(1.0) ))
3.1415926535897931
$ echo $(( f = sin(0.3) ))
0.29552020666133955
$ print $((1e12 * rand48()))
847909677310.23413
$ print $(( rand48(seed) ))
0.0104348833470027