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...
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...
# 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...
\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...
/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*$Rad] set Area [...
Isight高级教程adv_02_Tcl iSIGHTAdvancedTrainingTcl Tcl TheunderlyinglanguageofiSIGHTistheTool CommandLanguage,Tcl(pronouncedtickle)Properties InterpretiveProgrammableFewDataStructures-variables,lists,arraysOnedatatype-string 2 MDOLandTcl Userscancustomizetheirapplicationby addingTcltothe...
if is comparable with Tcl's if. For example:$[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 $[~ elseif...
if {$argc >=1 } { set N 1 foreach Arg $argv { puts stdout $N:$Arg\n set N [expr $N +1 ] if {$Arg== ring } { puts stdout \a } } } else { puts stdout $argv0 on X Display $env(DISPLAY)\n } Linux中以上脚步命名为hello3,则运行脚本以下结果为: $ ./hello3.tcl ___...
/usr/bin/Tclsh # #Demonstrateoperatorsand #mathfunctions setPI[expr2*asin(1.0)] if{$argc==3}{ setX[lindex$argv0] setY[lindex$argv1] setRad[lindex$argv2] setDist[exprsqrt(($X*$X)+($Y*$Y))] ...
compare two strings for equality (eq) or inequality (ne). and two operators for checking if a string is contained in a list (in) or not (ni). These operators all return 1 (true) or 0 (false). Using these operators ensures that the operands are regarded exclusively as strings (and li...