Editing Plankalkül (section)

===Two-dimensional syntax===
Because indexes of variables are written vertically, each Plankalkül instruction requires multiple rows to write down.{{citation needed|date=November 2016}}

First row contains variable kind, then variable number marked with letter V ({{langx|de|Variablen-Index}}), then indexes of variable subcomponents marked with K ({{langx|de|Komponenten-Index}}), and then ({{langx|de|Struktur-Index}}) marked with S, which describes variable type. Type is not required, but Zuse notes that this helps with reading and understanding the program.<ref name="Bauer-Wössner_1972"/>{{rp|page=681}}

In the line <math>S</math> types <math>S0</math> and <math>S1</math> could be shortened to <math>0</math> and <math>1</math>.<ref name="Bauer-Wössner_1972"/>{{rp|page=681}}

Examples:

{|cellpadding=5 style="border:1px solid #BBB; width:600px;"
|-
| <math>\begin{array}{r|l}
    & V \\ 
  V & 3 \\
  K & \\
  S & m \times 2 \times 1 \cdot n
 \end{array}</math>
| variable V3&nbsp;— list of <math>m</math> pairs of values of type <math>S1 \cdot n</math>
|-
| <math>\begin{array}{r|l}
    & V \\ 
  V & 3 \\
  S & m \times 2 \times 1 \cdot n
 \end{array}</math>
| Row K could be skipped when it is empty. Therefore, this expression means the same as above.
|-
| <math>\begin{array}{r|l}
    & V \\ 
  V & 3 \\
  K & i \cdot 0 \cdot 7 \\
  S & 0
 \end{array}</math>
| Value of eights bit (index 7), of first (index 0) pair, of і-th element of variable V3, has Boolean type (<math>S0</math>).
|}

Indexes could be not only constants. Variables could be used as indexes for other variables, and that is marked with a line, which shows in which component index would value of variable be used:

{|cellpadding=5 style="border:1px solid #BBB; width:600px;"
|-
| [[File:Plankalkül variable index.png|Using variable as index for other variable, in 2d Plankalül notation]]
| Z5-th element of variable V3. Equivalent to expression <code>V3[Z5]</code> in many modern programming languages.<ref name="Bauer-Wössner_1972"/>{{rp|page=681}}
|}