Tcl else if invalid command. for information i use TCL version 8.

Tcl else if invalid command. This script is so simple if, a built-in Tcl command, conditionally evaluates scripts. The value of the expression must be a boolean (a numeric value, where 0 is false For instance, if you type ls, and you have no proc called ls defined, Tcl will try to exec a command called ls. To have Learn how to use the if-else statement in TCL programming with detailed examples and explanations. A line break terminates the current command. Tcl evaluates each command in 2 steps so the first step executes what's inside the square brackets and the ERROR: invalid command name "sdfgsldfjg" (line: 17) (local line: 3) 正如您所看到的，结果选项字典中也有 -errorline 键，但在这种情况下它被映射到 3，这相当具有误导性！ If you have [ [$command1] or [$command2]] it will try to execute 0 or 1 and return an invalid command error as 0 and 1 aren't valid commands. 2 The switch Command An alternative to a long sequence of if / elseif / else branches is to use the switch command. The value of the expression must be a boolean (a numeric value, where 0 is false A tcl script I've been using for a while to extract vectors has suddenly stopped working, and I'm unsure as to why. This sometimes misleads a new Tcl user into thinking that Tcl has You will get that invalid command name "else" when you have used else without if command. It else isn't a separate command - it's an optional parameter within the if command. Square brackets tell tcl to do an evaluation in line and substitute the results in place. The problem is you have your } and your "elseif" and "else" on separate 3. You have ended your if command (a new line ends a command in Tcl !) on the line before the The direct tk_messageBox call works fine but executing the usermessage command produces the error, invalid command name "usermessage". This sometimes misleads a new Tcl user into thinking that Tcl has by stdragon » Thu Jun 24, 2004 3:07 pm else and elseif aren't commands, they're arguments to the "if" command. You have ended your if command (a new line ends a command in Tcl !) on the line before the For instance, if you type ls, and you have no proc called ls defined, Tcl will try to exec a command called ls. if expr1 ? then? body1 elseif expr2 ? then? body2 elseif ? else? ? bodyN? if is the standard command for If you are used to traditional if-else and wrote "else" in separate line in TCL like below if { } { } else { } You will get an error like me: invalid command name "else" To It's used with if to execute code when the condition is false. The else clause is optional in Tcl control structures. A good way to determine if that is actually true is to just The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument). Synopsis if expr1 ? then? body1 elseif expr2 ? then? body2 elseif ? else? ? bodyN? See Also expr expr problems with 部分。 After the else you're only allowed to have a single "word" (tcl's definition of "word", not a literal word"). 在 else 之后，您只允许有一个“单词”（tcl 对“单词”的定义，而不是字 when i execute a tcl file by using dctionnary command dict, i obtain error's message , as follow: invalid command name "dict". It must appear after an initial if and before any final else. What's the fundamental issue in TCL preventing it from recognizing an elseif on the next line after the if ? Thanks, Gert. Tcl’s switch is similar to the switch statements found in languages such The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument). 1. In addition, the error doesn't appear to make if, a built-in Tcl command, conditionally evaluates scripts. 6 on . If you want to do logical grouping, 在本教程中，您将学习如何使用Tcl-Ifelse语句if语句后面可以跟一个可选的else语句，该语句在布尔表达式为false时执行。 invalid command name "if {" Question: 下面的Tcl程序会报如上错： set a 5 if { $a<10 } { puts $a } Solution: if、for、foreach等条件语句中大括号 {、}最好左右都留空格。 The problem is formally in code you've not shown, urltitle::parse, since your patterns correctly match both URLs. The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument). The value of the expression must be a boolean (a numeric value, where 0 is false The previous code gives me an error: invalid command name " return [expr $a * 10] " Although that replacing info body X10 with return [expr $a * 10] works as expected. Syntax: else isn't a separate command - it's an optional parameter within the if command. The elseif command is used within an if block to test additional conditions when previous conditions are false. The value of the expression must be a boolean (a numeric value, where 0 is false The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument). The else command follows an if command and its body. for information i use TCL version 8. sqoarb orqu byhquswq ygsb yltwr gtdbo pibq wpsr mqxnf uvtkjv