The Tclelseifcommand provides additional conditional branching inifexpressions. It allows testing multiple conditions in a single control structure. This makes code more readable and efficient. Basic Definition
puts "Line 1 - Condition is true\n" } if { a ||b } { puts "Line 2 - Condition is true\n" } # lets change the value of a and b set a 0 set b 10 if { a &&b } { puts "Line 3 - Condition is true\n" } else { puts "Line 3 - Condition is not true\n" } if {...
else can be used with boolean operators for more complex conditions. boolean_else.tcl set a 10 set b 20 if {$a > $b || $a == $b} { puts "a is greater than or equal to b" } else { puts "a is less than b" } This demonstrates using logical OR (||) in the condition. ...
Tcl 中的循环命令是while、for和foreach。条件(转移)命令是if/then/else/elsif和switch。上述命令的限定语句是break、continue、return和error。最后,catch命令提供了错误处理能力。 if/then/else/elsif已在前面几屏中演示过。在正式语法中会用到then,但通常会省略掉它。 在左边这个示例中,foreach结构给switch命令提...
if {$Arg == "ring"} { puts stdout "\a" } } } else { puts stdout "$argv0 on \ X Display $env(DISPLAY)\n" } *** ~/tcltk$./hello3.tcl./hello3.tcl on X Display :0.0 ~/tcltk$./hello3.tcl ring1: ring 当Tcl/Tk 脚本开始运行时,存在几个全局变量(如果在当前环境中为非空,...
\c Replaced with literal c if c is not one of the cases listed above. In particular, \$, \", \{, \}, \], and \[ are used to obtain these characters. Arithmetic Operators Table 1–2 Arithmetic operators from highest to lowest precedence. -~! Unary minus, bitwise NOT, logical NOT...
if is comparable with Tcl's if. For example:$[set x abc] $[+ if {$x eq "abc"} +] x is abc $[--] $[+ if {$x eq "xyz"} +] x is xyz $[--] will producex is abc As in Tcl, we can also use else and elseif, by using the syntax $[~ else ~] or $[~ elseif...
/usr/bin/tclsh # # Demonstrate operators and # math functions set PI [expr 2 * asin(1.0)] if {$argc == 3} { set X [lindex $argv 0] set Y [lindex $argv 1] set Rad [lindex $argv 2] set Dist [expr sqrt(($X*$X)+($Y*$Y))] set Cir [expr 2*$PI*$Rad] set Area [...
# Demonstrate operators and # math functions set PI [expr 2 * asin(1.0)] if {$argc == 3} { set X [lindex $argv 0] set Y [lindex $argv 1] set Rad [lindex $argv 2] set Dist [expr sqrt(($X*$X)+($Y*$Y))] set Cir [expr 2*$PI*$Rad] set Area [expr $PI*$Rad*$Rad...
Isight高级教程adv_02_Tcl iSIGHTAdvancedTrainingTcl Tcl TheunderlyinglanguageofiSIGHTistheTool CommandLanguage,Tcl(pronouncedtickle)Properties InterpretiveProgrammableFewDataStructures-variables,lists,arraysOnedatatype-string 2 MDOLandTcl Userscancustomizetheirapplicationby addingTcltothe...