无涯教程-Tcl - if语句函数

if 语句包含一个布尔表达式，后跟一个或多个语句。

if - 语法

if {boolean_expression} {
   # statement(s) will execute if the Boolean expression is true
}

if - 流程图

if - 示例

#!/usr/bin/tclsh
set a 10
#使用 if 语句检查布尔条件
if { a </span><span class="pun">&lt;</span><span class="pln"> </span><span class="lit">20</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
   </span><span class="com"># 如果条件为真，则打印以下内容</span><span class="pln">
   puts </span><span class="str">"a is less than 20"</span><span class="pln"> 
</span><span class="pun">}</span><span class="pln">
puts </span><span class="str">"value of a is : a" 

编译并执行上述代码后，将产生以下输出-

a is less than 20
value of a is : 10

参考链接

www.learnfk.com/tcl-tk/tcl-…