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Category:PL/I: Difference between revisions
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{{stub}}{{language|PL/I}}
<lang>
PL/I is a general purpose programming language suitable for commercial, scientific, non-scientific, and system programming.
It provides the following data types:
Floating-point,
Decimal integer,
Binary integer,
Fixed-point decimal (with fractional part),
Fixed-point binary (that is, with fractional part),
Character strings of two kinds:
1. fixed-length, and
2. varying-length.
Bit strings of two kinds:
1. fixed-length, and
2. varying length.
The float, integer,and fixed-point types can be real or complex.
Multiple precisions are available for binary fixed-point:
typically using 8 bits, 16 bits, 32 bits, and 64 bits.
Multiple precisions are available for floating point:
typically using 32 bits, 64 bits, and 80 bits.
The language provides for static and dynamic arrays.
Of the latter, there are automatic and controlled.
Controlled can be aplied to any data type, including
scalar, structure, as well as arrays.
With controlled, a push-down and pop-up stack is automatically used.
PL/I has four kinds of I/O:
For simple I/O commands, list-directed input and output
requires only the names of the variables.
Default format is used, based onthe variable's declaration.
For simple I/O commands, data-directed input and output
requires only the names of the variables. For this form,
both the names of the variables and their values are transmitted.
When precise layouts of input and output data is required,
edit-directed I/O is used. A format is specified by the user.
The format is flexible, and permits the number of digits, and
the number of places after the decimal point to be specified
dynamically. The format may also be specified in picture form.
for files held on storage media, record-oriented transmission
is often used, either for sequential or random access.
PL/I has built-in checking for such programmer conditions
including subscript-range checking, floating-point overflow,
fixed-point overflow, division by zero, substring range checking,
and stringsize checking. Any of those may be enabled or disabled
by the user.
When any of those conditions occurs, the user may trap them and
recover from them and continue execution.
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