This is good, reviewing, I noticed that the problem you show about 20:30 or so can be solved using a pretty simple syntax: % puts ${sentence} this has 3 wordssdrow 3 sah siht % set { my stupid variable name } {don't do this} don't do this % puts ${ my stupid variable name } don't do this % puts $sentence4 can't read "sentence4": no such variable % puts ${sentence}4 this has 3 wordssdrow 3 sah siht4
@jvsnyc
9 ай бұрын
Competent presentation. The description of the way to continue a logical line across physical lines is inaccurate The '\' at the end of the line gets replaced with a single space character, it doesn't disappear entirely in Tcl. This is important to realize when it is used, or you will be confused about the number of word arguments in that Tcl command. From the dodekalogue: \whiteSpace A single space character replaces the backslash, newline, and all spaces and tabs after the newline. This backslash sequence is unique in that it is replaced in a separate pre-pass before the command is actually parsed. This means that it will be replaced even when it occurs between braces, and the resulting space will be treated as a word separator if it isn't in braces or quotes.
@santaespinal1540
8 ай бұрын
🎯 Key Takeaways for quick navigation: 00:07 📚 *Introduction to Tcl* - Tcl, Tool Command Language, developed by Oscar in UC Berkeley for scripting purposes. - Balances complex programming needs with quick and interactive development for scripting. 02:30 🌐 *Tcl's Platform Independence* - Tcl is platform-independent, allowing easy connection and extension of multiple applications. - Widely used in commercial tools, including the synopsis toolset. 04:13 📜 *Tcl Program Structure* - Tcl programs are a sequence of commands, each command separated by new lines or semicolons. - Command structure: First word as command name, others as arguments; commands always result in a string. 06:21 🔤 *Variable Substitution in Tcl* - Variable substitution syntax: ` followed by variable name (letters, digits, underscores). - Variables can occur anywhere in a word; substitution doesn't change the word structure. 16:46 ⚙️ *Command Substitution in Tcl* - Command substitution syntax: `[]` contains script/command to be evaluated. - Substitutes the result of the executed command within the overall command. 26:37 🚧 *Word Structure and Substitution Rules* - Double quotes prevent word breaks; treated as one continuous string. - Curly braces keep content as one unit, preventing word breaks. - Backslash (\) escapes special characters, preventing word breaks and newline continuation. 30:08 🔄 *Additional Substitution Techniques* - `eval` for another level of expansion; allows dynamic script evaluation. - `exec` for executing external commands, handling complex arguments with proper formatting. 32:40 🧠 *Tcl File Manipulation* - Demonstrates using `eval` and `exec` to remove specific files in Tcl. - Discusses challenges and alternative methods for file deletion. - Encourages viewers to try a specific challenge related to file removal. 34:08 🖥️ *Tcl Expressions Overview* - Explains Tcl expressions, drawing parallels with integer and floating-point operations. - Highlights command and variable substitutions within expressions. - Discusses logical operations, automatic type conversion, and potential pitfalls in Tcl expressions. 38:18 🔄 *Expr Command Examples* - Illustrates examples of Tcl `expr` command usage with different operations. - Explains how Tcl promotes integers to reals when needed. - Emphasizes the influence of expression structure on the final result. 41:39 📚 *Tcl Arrays Basics* - Introduces Tcl arrays, associating indices and values. - Demonstrates array creation and manipulation. - Discusses the flexibility of array indices in Tcl. 43:14 🧙 *Tcl Arrays Trick: Simulating 2D Arrays* - Explains a method to simulate 2D arrays using single-dimensional arrays. - Illustrates the concept with an example. - Emphasizes the versatility of Tcl arrays. 47:16 🧮 *Tcl String Operations* - Discusses string operations in Tcl, including comparisons and concatenation. - Cautions about potential challenges when handling strings that resemble numbers. - Mentions the use of the `string compare` function. 48:08 📋 *Tcl Lists Introduction* - Introduces Tcl lists as collections of elements separated by whitespace. - Explains list creation with curly braces and backslashes. - Lists key commands related to Tcl lists. 51:46 🔄 *Stack Operations in Tcl* - Demonstrates stack operations using `push` and `pop` commands. - Explains how Tcl treats curly braces in stack operations. - Emphasizes the simplicity and utility of stack commands in Tcl. 52:35 🚫 *Pitfalls in List Recognition* - Highlights common mistakes in list recognition. - Differentiates between valid and invalid list structures. - Emphasizes the role of curly braces in forming valid lists. 54:42 🔄 *Command and List Relationship* - Discusses the close relationship between commands and lists in Tcl. - Mentions the use of `eval` for evaluating lists as commands. - Explains how commands are essentially lists in Tcl. 55:27 🚀 *Tcl Expr Command Summary* - Summarizes key points about Tcl expressions and the `expr` command. - Highlights the left-to-right evaluation and handling of floating-point numbers. - Encourages understanding the intricacies of Tcl expressions for effective programming. Made with HARPA AI
@devopseng8917
5 жыл бұрын
Hi Can someone please tell me how to install packages in tcl like db connectivity packages ...etc
@raghureddy3237
8 жыл бұрын
Thanks, useful
@bollanarasimhareddy267
5 жыл бұрын
these classes will helpful for vlsi physical design ?
@kshirodchandramohapatra2482
5 жыл бұрын
yup bro
@mountneerdubai1176
5 жыл бұрын
SOOO POOOR DELIVERY!!!!
@rajraj-ey7eh
7 жыл бұрын
hi, tcl is tool command language or tool control language?
Пікірлер: 14