Table of Contents
How to use format command in Tcl?
- format , a built-in Tcl command, produces a formatted string from a given template.
- A conversion specifer begins with % and is followed, in order, by a position specifier, a set of flags, a minimum field width, a precision, a size modifier, and a conversion characer, which is the only mandatory component.
How do I use EXPR in Tcl?
A Tcl expression consists of a combination of operands, operators, parentheses and commas. White space may be used between the operands and operators and parentheses (or commas); it is ignored by the expression’s instructions. Where possible, operands are interpreted as integer values.
How do you write a loop in Tcl?
Syntax
- The initialization step is executed first, and only once. This step allows you to declare and initialize any loop control variables.
- Next, the condition is evaluated.
- After the body of the for loop executes, the flow of control jumps back up to the increment statement.
- The condition is now evaluated again.
What is eval TCL?
Eval concatenates all its arguments in the same fashion as the concat command, passes the concatenated string to the Tcl interpreter recursively, and returns the result of that evaluation (or any error generated by it).
What is variable Tcl?
Variables in tcl can be defined with the command set and the value can be used with $variable_name . Arrays can be indexed with arbitrary names in (). Curly braces are used to separate variable names from following characters.
How do I reverse a string in Tcl?
Description. Returns a string containing the characters of its input argument, string, in reverse order. Implemented in the Changes in Tcl/Tk 8.5, as part of TIP #272[L1 ]. This command converts its argument to the “unicode” object type so that it doesn’t have to use Tcl_UtfPrev() masses of times.
How do I concatenate in Tcl?
Tcl does concatenation of strings as a fundamental operation; there’s not really even syntax for it because you just write the strings next to each other (or the variable substitutions that produce them).
What is source in Tcl?
DESCRIPTION. This command takes the contents of the specified file or resource and passes it to the Tcl interpreter as a text script. The return value from source is the return value of the last command executed in the script.
What is string in Tcl?
A string is a sequence of characters. String in Tcl, unlike in other languages, need not be always enclosed within double quotes. They are necessary only if we have a space between words. Tcl is a string based language. It provides a rich set of commands for manipulating strings.
What does {*} mean in TCL?
Description. {*} promotes the items in a list to individual arguments of the current command. For example, set {*}[list greeting hello]
How do I use Regsub in TCL?
tcl Regular Expressions Substitution The regsub command is used for regular expression matching and substitution. set mydata {The yellow dog has the blues.} # create a new string; only the first match is replaced. set newdata [regsub {(yellow|blue)} $mydata green] puts $newdata The green dog has the blues.
How to combine two strings in Tcl?
concat, a built-in command, joins strings together. If the strings are lists, the effect is to join the lists together.
How to convert a list into string in Tcl?
split – Split a string into a proper Tcl list SYNOPSIS split string?splitChars? DESCRIPTION Returns a list created by splitting string at each character that is in the splitChars argument. Each element of the result list will consist of the characters from string that lie between instances of the characters in splitChars.
What is the difference between TCL 43s517 and Tcl?
While 120Hz CMI of TCL S525 and S517 can deliver fluid motion images, Auto Game Mode that integrated with TCL S525 is able to bring more responsive gaming scenes. The third key difference comes from the remote control that included with TCL S525 and S517. TCL S525 only comes with RC280 remote control, while TCL S517 comes with RC580 remote control.
How to format format string?
Definition and Usage. The format () method formats the specified value (s) and insert them inside the string’s placeholder.