TAL Reference Manual

Glossary
Glossary—526371.001
Glossary-4
conditional expression.
conditional expression. An expression that establishes the relationship between values
and results in a true or false value; an expression that consists of relational or Boolean
conditions and conditional operators.
constant. A number or a character string.
constant expression. An arithmetic expression that contains only constants, LITERALs,
and DEFINEs as operands.
CPU. Central processing unit. Historically, the main data processing unit of a computer. A
NonStop system has multiple cooperating processors rather than a single CPU;
processors are sometimes called CPUs.
CRE. Common Run-Time Environment. Services that facilitate D-series mixed-language
programs.
CREDECS. A file, provided by the CRE, that contains external declarations for CRELIB
functions whose names begin with CRE_. See also CRELIB
CRELIB. A library file, provided by the CRE, that contains functions for sharing files,
manipulating $RECEIVE, terminating the CRE, and performing standard math
functions and other tasks.
Crossref. A stand-alone product that collects cross-reference information for your program.
CROSSREF. A compiler directive that collects cross-reference information for your
program.
cross-references. Source-level cross-reference information produced for your program by
the CROSSREF compiler directive or the Crossref stand-alone product.
C-series system. A system that is running a C-series RVU version of the Guardian 90
operating system.
data declaration. A means by which to allocate storage for a variable and to associate an
identifier with a variable, a DEFINE, or a LITERAL.
data segment. A segment that contains information to be processed by the instructions in
the related code segment. Applications can read and write to data segments. Data
segments contain no executable instructions.
Condition
Code Meaning
Expression
Status Procedure Call Status
CCG Condition-code-greater-than Positive Warning
CCL Condition-code-less-than 0 Error
CCE Condition-code-equal-to Negative Successful execution