Tcl - Nested If Statement


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It is always legal in Tcl to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement(s).

Syntax

The syntax for a nested if statement is as follows −

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

You can nest else if...else in the similar way as you have nested if statement.

Example

#!/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"

When the above code is compiled and executed, it produces the following result −

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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