9月14学习内容


上这个课压根听不听或者听不懂。。。。

使用swift查找文件名和扩展名方法代码:
let fileName = "fileName.txt.swift" let dotIndex = "fileName.lastIndex(of:".")" let name = fileName[ ..< dotIndex] let indexAfterDot = fileName.index(after:doutIndex) let extension = fileName[indexAfterDot ..<fileName.endIndex] print("name:\(name)") print("extension:\(extension)")
Last login: Tue Sep 14 14:39:01 on console software37@software37 ~ % cd workspace0302203223 software37@software37 workspace0302203223 % ls algorithm algs4.jar cpp opp swift software37@software37 workspace0302203223 % cd algorithm software37@software37 algorithm % ;s zsh: command not found: s software37@software37 algorithm % ls ArrayStack.java Flips.class Link.java algs4-data test.swift Counter.class Flips.java Linkedst.java algs4-data.zip Counter.java Flips.swift StackTest{} algs4.jar software37@software37 algorithm % vi F software37@software37 algorithm % ls ArrayStack.java Flips.class Link.java algs4-data test.swift Counter.class Flips.java Linkedst.java algs4-data.zip Counter.java Flips.swift StackTest{} algs4.jar software37@software37 algorithm % vi Counter. software37@software37 algorithm % vi Counter.java software37@software37 algorithm % vi Flips.java software37@software37 algorithm % vi test.java software37@software37 algorithm % vi Linkedst.java software37@software37 algorithm % vi StackTest{} software37@software37 algorithm % vi Stacktest software37@software37 algorithm % vi StackTest.java software37@software37 algorithm % vi test.swift software37@software37 algorithm % ArrayStack.java zsh: command not found: ArrayStack.java software37@software37 algorithm % ArrayStack.java zsh: command not found: ArrayStack.java software37@software37 algorithm % ls ArrayStack 2.java Flips.java algs4-data ArrayStack.java Flips.swift algs4-data.zip Counter.class Link.java algs4.jar Counter.java Linkedst.java test.swift Flips.class StackTest.java software37@software37 algorithm % ArrayStack.java zsh: command not found: ArrayStack.java software37@software37 algorithm % Link.java zsh: command not found: Link.java software37@software37 algorithm % vi ArrayStack.java software37@software37 algorithm % vi Average.java software37@software37 algorithm % vi Bag.java software37@software37 algorithm % vi Average.java software37@software37 algorithm % VI Average.java bag.add(x); } double m = a.mean(); double sum = 0; for(double x:bag){ sum +=(x-m)*(x-m); } int n=bag.size()-1; int n bag.size()-1; double stderr =Math.sqrt(sum)/n; StdOut.println(a); StdOut.println("stderr:"+String.fromat("%.5f",stderr)); } }
符攀飞 符攀飞
大约 1 个月前
46

扫描下方二维码手机阅读文章

0