Block

Normally one process is drawn in one box, but sometimes you may want to put several processes in the same box. I call this kind of box, with several processes in it, as a block.

To draw a block, enclose the commands to be put in the block with line ONLY with {(left brace) and line ONLY with }(right brace) . Here is an example. This is an addition of two vectors.

    {
        input a.x
        input a.y
    }
    {
        input b.x
        input b.y
    }
    {
        c.x = a.x + b.x
        c.y = a.y + b.y
    }
    {
        print c.x
        print c.y
    }

You can use almost any character in a block, and they will be printed as they are. There are some exceptions, though:

• a string that consists of only one { or }.
• a string that begins with / or //.

By adding an empty line in a block, you can put an empty line in output accordingly.

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Sun Nov 10 01:36:04 JST 1996