Tcl巢狀if-else語句它始終是合法的,這意味著可以使用一個 if 或 else if 在另一 if 或 else if 宣告中。
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 } }
可以巢狀else if...else 在類似巢狀if語句的方式。
#!/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"
當上述程式碼被編譯和執行時,它產生了以下結果:
Value of a is 100 and b is 200 Exact value of a is : 100 Exact value of b is : 200