tcl的helloworld

http://www.tcl.tk/man/tcl8.5/tutorial/tcltutorial.html

puts "Hello, World - In quotes"    ;# This is a comment after the command.
# This is a comment at beginning of a line
puts {Hello, World - In Braces}
puts "This is line 1"; puts "this is line 2"

puts "Hello, World; - With  a semicolon inside the quotes"

# Words don't need to be quoted unless they contain white space:
puts HelloWorld
puts {Bad comment syntax example}   # *Error* - there is no semicolon!

输出：

Hello, World - In quotes
Hello, World - In Braces
This is line 1
this is line 2
Hello, World; - With  a semicolon inside the quotes
HelloWorld
wrong # args: should be "puts ?-nonewline? ?channelId? string"
    while executing
"puts {Bad comment syntax example}   # *Error* - there is no semicolon!"
    (file "helloworld.tcl" line 10)

--------------------------

set x 1

# This is a normal way to write a Tcl while loop.

while {$x < 5} {
    puts "x is $x"
    set x [expr {$x + 1}]
}

for {set i 0} {$i < 10} {incr i} {
    puts "I inside first loop: $i"
}

------又发现搞笑代码了--魔幻语言就是让人容易误解--

proc sum {arg1 arg2} {
    set x [expr {$arg1 + $arg2}];
    return $x
}

puts " The sum of 2 + 3 is: [sum 2 3]\n\n"

proc for {a b c} {
    puts "The for command has been replaced by a puts";
    puts "The arguments were: $a\n$b\n$c\n"
}

for {set i 1} {$i < 10} {incr i}

输出：

 The sum of 2 + 3 is: 5


The for command has been replaced by a puts
The arguments were: set i 1
$i < 10
incr i

http://www.tcl.tk/man/tcl/tutorial/Tcl12.html