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Example: 

## 3.C. Constant Definition Part 

label 13, 00100, 99; 

A constant definition introduces an identifier as a synonym for a constant. The symbol const heads the constant definition part, which has the general form: 

<img src='content_image/777146.jpg'>

where a constant is either a number, a constant identifier (possibly signed), a character, or a string. 

<img src='content_image/777145.jpg'>

The use of constant identifiers generally makes a program more readable and acts as a convenient documentation aid. It also allows you to group machine- or example-dependent quantities at the beginning of the program where they can be easily noted and changed or both. This improves the portability and modularity of the program. 

