The string type is predefined in the package Standard as a standard one-dimensional array type with each element being of the type Character.

Syntax:

type string is array (positive range <>) of character; 

Description:

The type String is an unconstrained vector of elements of the type Character. The number of characters in a string must be specified during its declaration. Assignments to a String can be done in the same way as in case of any arrays, i.e. using single element assignments, concatenation, aggregates, slices or any combination of them.

A String can have an explicit number base for Binary, Octal or Hexadecimal values.
B"value"  -- binary
O"value"  -- octal
X"value"  -- hexadecimal

Example:

"hello world" 
"0000XXXX"
B"0010_1100"
  

Notes:

• Strings are written in double quotes. Single elements, however, are of the type Character, therefore values assigned to single elements (referred by the index) are specified in single quotes.
• Strings are case sensitive.

See also:

Enumeration, Standard Package