TCL嵌套if语句

Tcl嵌套if-else语句它始终是合法的，这意味着可以使用一个 if 或 else if 在另一 if 或 else if 声明中。

语法

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
   }
}

可以嵌套else if...else 在类似嵌套if语句的方式。

示例

#!/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"

Value of a is 100 and b is 200
Exact value of a is : 100
Exact value of b is : 200