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At first, with an editor

   figure31
Figure 1: Addition from 1 to N

Because pad2ps series are tools to draw PAD figures from a text file, you first need to create a PAD source using an editor. A PAD source is written following PADEL(PAD Expression Language) syntax. The detail about PADEL is fully described in Chapter 3, so I will give you one example for now. The following file will produce the PAD figure in Figure 1.

If you are familiar to C language, you probably notice the source resembles C syntax; To draw PAD figure with pad2ps series, you need to create C-like file like this one.

    Addition from 1 to N
    {
        input N
    
        if(N > 1){
            sum = 0
            for(i = 1 , N){
                sum = sum + i
            }
    
            print sum
        }
    }

Let's save this file as foo.pad.

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Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.
Sun Nov 10 01:36:04 JST 1996