HP Pascal/iX Reference Manual (31502-90022)

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A variable of type string can be compared with a similar variable or a
string literal or can be assigned to a variable of type string. A string
literal can be assigned to a variable of type string.
The following standard procedures and functions manipulate strings:
* Setstrlen sets the current length of a string without changing its
contents.
* Str returns a specified portion of a string, such as a substring.
* Strappend appends one string to another.
* Strdelete deletes a specified number of characters from a string.
* Strinsert inserts one string into another.
* Strlen returns the current length of a string.
* Strltrim and strrtrim trim leading and trailing blanks,
respectively, from a string.
* Strmax returns the maximum length of a string.
* Strmove copies a substring from a source string to a destination
string.
* Strpos returns the position of the first occurrence of a specified
string within another string.
* Strread reads one or more values from a string.
* Strrpt returns a string composed of a designated string repeated a
specified number of times.
* Strwrite writes one or more values to a string.
WITH Statement.
The record designator in a WITH statement can be a call to a function
that returns a record as its result, or a structured constant.
Numeric Conversion Functions.
The functions binary, octal, and hex convert a parameter of type string
or PAC, or a string literal, to an integer. These functions interpret
the parameter the following ways:
* Binary interprets the parameter as a binary value.
* Octal interprets the parameter as an octal value.
* Hex interprets the parameter as a hexadecimal value.
Modules.
HP Pascal supports separately compiled program fragments called modules .
Modules can be used to satisfy the unresolved references of another
program or module. Typically, a module "exports" types, constants,
variables, procedures, and functions. A program can then "import" a
module to satisfy its own references.
This mechanism allows commonly used procedures and functions to be
compiled separately and used by more than one program without having to
include them in each program.