Tcl - 嵌套 If 语句


在 Tcl 中嵌套if-else 语句始终是合法的,这意味着您可以在另一个 if 或 else if 语句中使用一个 if 或 else if 语句。

句法

嵌套 if语句的语法如下 -

if { boolean_expression 1 } {
   # Executes when the boolean expression 1 is true 
   if {boolean_expression 2} {
      # Executes when the boolean expression 2 is true
   }
}

您可以以与嵌套if语句类似的方式嵌套else if...else

例子

#!/usr/bin/tclsh

set a 100
set b 200
 
# check the boolean condition 
if { $a == 100 } {
   # if condition is true then check the following 
   if { $b == 200 } {
      #if condition is true then print the following 
      puts "Value of a is 100 and b is 200"
   }
}
puts "Exact value of a is : $a"
puts "Exact value of b is : $b"

当上面的代码被编译并执行时,它会产生以下结果 -

Value of a is 100 and b is 200
Exact value of a is : 100
Exact value of b is : 200
tcl_decisions.htm