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Should you want to make the value of a variable part of string, you only need to evaluate it within that string. The value of the variable becomes part of the string. In the following statement, the value of the variable myname is used as part of a string. In this case, the string will be "My name is Larisa".
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set myname "Larisa" set mystr "My name is $myname"
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Certain commands are designed to operate on variables. The append command concatenates a string to a variable. The incr command will increment an integer, and the unset command will undefine a variable. The different commands that operate on variables are listed in Table 5. Table 5: Assignments: and Variables Description Assign a value to a variable Declare global variables Increment a variable by an integer value Delete variables Reference a variable in a different scope Declare namespace variables
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Commands set global incr unset upvar variable
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Table 5: Assignments: and Variables Description Array access operations like searches Math expressions
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Array elements are defined and assigned values using the set command with the index encased in parentheses. The following example assigns the string "rain" as the second element in the weather array:
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set weather(2) rain
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You can then reference the element using its index encased in parentheses with the array name preceded with a $.
puts $weather(2) rain
Tcl allows the use of any word string as an index, in effect supporting associative arrays. The string used as the index is encased within parentheses next to the array name. The following statements add two elements to the city array with the index strings Napa and Alameda:
set city(Napa) 34 set city(Alameda) 17
Control Structures
Tcl has a set of control structures similar to those used in the Perl, Gawk, C shell, and C programming languages. Tcl has loops with which you can repeat commands and conditions that allow you to choose among specified commands. Table 6 lists the Tcl control structures. Control structures in Tcl often make use of a block of Tcl commands. A block of commands consists of Tcl commands enclosed in braces. The opening brace ({) will begin on the same line as that of the control structure that uses it. On following lines, there can be several Tcl commands, each on its own line. The block ends with a closing brace (}) on a line by itself. A block is literally an argument to a Tcl command. The block is passed to a control structure command, and the control structure will execute the commands in that block.
The if control structure allows you to select alternative actions. The if command takes two arguments, a test expression and a Tcl command or block of commands. Each is encased in its own set of braces. The test expression is used to determine if the Tcl commands will be executed. If the test expression is true, the commands are performed. If not, the commands are skipped. Below is the syntax for the if structure. You can specify alternative commands to execute if the expression is false by attaching an else block with those Tcl commands. You can nest if structures using the elseif command. Table 6: Tcl: Control Structures
Control Structures if switch while for foreach break
Description Conditional command, extend with else and elseif blocks Switch selection structure The while loop The for loop, like the C for loop Loop through a list, or lists, of values Forced loop exit
if {test-expression} { Tcl commands } elseif {test-expression} { Tcl commands } else { Tcl commands }
Note Keep in mind that the else and elseif keywords must be on the same line as the closing brace of the previous block, as in } elseif { test-expression} { . The opening brace of the next block must also be on the same line.
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