# c (Concatenate) processing code

The c processing code concatenates elements
for output.

| System Processors | List |
| --- | --- |
| Code Type | Attribute Defining |
| Dictionary Attributes | Output Conversion |

## Syntax

```
celement{;element...}
celement{/*}
celement{xelement}{...}
```

## Parameters

| element | May be any of the following: Attribute mark count Any literal string enclosed in a system delimiter (‘ “ \) Asterisk (*), which means reuse result of last conversion |
| --- | --- |
| concatenation.char | A single concatenation character that separates the values and displays in between them. It may be any nonnumeric character, even a space, but not a system delimiter. The following concatenation characters have special meaning: |
| x | Specifies that the following element is the separation character to appear between successive elements. |
| ; | Specifies that no separating character is printed. When the semicolon is used, literal strings must be enclosed in single quotes. |

## Description

Each element may be delimited
by a character to appear on output. If the semicolon is the element
separator, it does not display on output. The elements can be:

- Numeric constants, enclosed in quotation marks.

- An attribute position, referenced by its numeric attribute count.

- An alphanumeric character string enclosed in quotation marks, double quotation marks, or backslashes. When delimited by semicolons, strings must be enclosed in quotation marks; otherwise, alphanumeric strings are not separated from the other entries by semicolons.

The asterisk is a special character used to concatenate the
resulting value from the last processing code operation. In the third
form listed under Syntax, x specifies the separator
to appear between the concatenated elements. The separator may be
any nonnumeric character including a space or semicolon, but cannot
be a system delimiter. The semicolon is a special separator that specifies
the elements are to be concatenated with no separation.

## Example(s)

| Stored Value | Processing Code | Output Data |
| --- | --- | --- |
| 014 ‘Hunter’ | | |
| 015 ‘Rockwell’ | c”Name :”;14,15 | ‘Name: Hunter,Rockwell’ |
| 001 ‘day’ | | |
| 002 ‘night’ | c1/2 | ‘day/night’ |

## See also

- [a (algebraic) processing code](https://d3codex.com/processingcodes/a-algebraic-processing-code/)
- [Processing codes (Update processor)](https://d3codex.com/updateprocessor/processing-codes-update-processor/)
- [output-conversion](https://d3codex.com/attributedefiningitem/output-conversion/)
- [Processing codes overview](https://d3codex.com/processingcodes/processing-codes-overview/)
- [Processing codes (Update processor)](https://d3codex.com/updateprocessor/processing-codes-update-processor/)

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Source: https://d3codex.com/processingcodes/c-concatenate-processing-code/ - part of the D3Codex reference.