append    Append values to variable binary      Insert and extract fields from binary strings regexp      Regular expression pattern matching ex1: regexp {^[0-9]+$}   510 ->1 regexp {^[0-9]+$}  -510 -> 0 regexp  {^([0-9]+) *([a-z]+)} "Walk 10 k…

1 doubel quotes This allows substitutions to occur within the quotations - or "interpolation". The substituted group is then evaluated as a single argument. puts "The current stock value is $varName" In general, the backslash (\) disab…

expr is for Tcl to do math operations. It takes all of its arguments ("2 + 2" for example) and evaluates the result as a Tcl "expression". Many commands use expr behind the scenes in order to evaluate test expressions, such as if, whil…

March 18, 2016 Problem statement: https://www.hackerrank.com/challenges/two-strings/submissions/code/18506948 Julia likes to try a new way to train herself to expand C#/ C++ / Java / JavaScript languages, by reading the solutions, followed up with so…

Tcl internal variables eryar@163.com 在Tcl中内置了一些变量,并赋予了一定的功能.内置变量列表如下: 变量名称 功能描述 argc 指命令行参数的个数. argv 指包含命令行参数的列表. argv0 是指被解释的文件或由调用脚本的名称的文件名. env 用于表示是环境变量数组元素. errorCode 为最后的Tcl错误的错误代码. errorInfo 为最后Tcl错误的堆栈跟踪信息. tcl_interactive 分别将其设置为1和0交互和非交互模式之…

StackOverFlow排错翻译 - Python字符串替换: How do I replace everything between two strings without replacing the strings? 原创连接: Python字符串替换 问题: Python:如何将两字符串之间的内容替换掉? I have this string(问题源码): str = ''' // DO NOT REPLACE ME // Anything might be here. Numbers…

Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numbers can be arbitrarily large and are non-negative. Converting the input string to integer is NOT allowed. You should NOT use internal library su…

Given two non-negative numbers num1 and num2 represented as string, return the sum of num1 and num2. Note: The length of both num1 and num2 is < 5100. Both num1 and num2 contains only digits 0-9. Both num1 and num2 does not contain any leading zero.…

Design an algorithm to encode a list of strings to a string. The encoded string is then sent over the network and is decoded back to the original list of strings. Machine 1 (sender) has the function: string encode(vector<string> strs) { // ... your…

Given a string, we can "shift" each of its letter to its successive letter, for example: "abc" -> "bcd". We can keep "shifting" which forms the sequence: "abc" -> "bcd" -> ... -> &quo…