Tcl – 巢狀 If 語句



在 Tcl 中總是可以巢狀if-else 語句,這意味著你可以在另一個 if 或 else if 語句中使用一個 if 或 else if 語句。

語法

巢狀 if 語句的語法如下 −

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

你可以像巢狀 if 語句一樣巢狀 else if...else

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"

當上面程式碼編譯並執行時,它會產生以下結果 −

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