h.pi

来自「强大的数学工具包」· PI 代码 · 共 9 行

                               * * * * * * *
                               *     Pi    *
                               * * * * * * *

        Pi is the representation of Pi (= 3.14... ) with the 
        precision of DIGITS digits. By default, DIGITS = 37. 
        In order to adjust this precision to s digits, please 
        type "DIGITS = s", where s is single precision number.