Gdb/Built 002dIn-Func 002fProc
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15.4.9.2 Built-in Functions and Procedures
Modula-2 also makes available several built-in procedures and functions. In describing these, the following metavariables are used:
a
- represents an
ARRAY
variable. c
- represents a
CHAR
constant or variable. i
- represents a variable or constant of integral type.
m
- represents an identifier that belongs to a set. Generally used in the same function with the metavariable
s
. The type ofs
should beSET OF mtype
(wheremtype
is the type ofm
). n
- represents a variable or constant of integral or floating-point type.
r
- represents a variable or constant of floating-point type.
t
- represents a type.
v
- represents a variable.
x
- represents a variable or constant of one of many types. See the explanation of the function for details.
All Modula-2 built-in procedures also return a result, described below.
ABS(n)
- Returns the absolute value of
n
. CAP(c)
- If
c
is a lower case letter, it returns its upper case equivalent, otherwise it returns its argument. CHR(i)
- Returns the character whose ordinal value is
i
. DEC(v)
- Decrements the value in the variable
v
by one. Returns the new value. DEC(v,i)
- Decrements the value in the variable
v
byi
. Returns the new value. EXCL(m,s)
- Removes the element
m
from the sets
. Returns the new set. FLOAT(i)
- Returns the floating point equivalent of the integer
i
. HIGH(a)
- Returns the index of the last member of
a
. INC(v)
- Increments the value in the variable
v
by one. Returns the new value. INC(v,i)
- Increments the value in the variable
v
byi
. Returns the new value. INCL(m,s)
- Adds the element
m
to the sets
if it is not already there. Returns the new set. MAX(t)
- Returns the maximum value of the type
t
. MIN(t)
- Returns the minimum value of the type
t
. ODD(i)
- Returns boolean TRUE if
i
is an odd number. ORD(x)
- Returns the ordinal value of its argument. For example, the ordinal value of a character is its ASCII value (on machines supporting the ASCII character set). The argument
x
must be of an ordered type, which include integral, character and enumerated types. SIZE(x)
- Returns the size of its argument. The argument
x
can be a variable or a type. TRUNC(r)
- Returns the integral part of
r
. TSIZE(x)
- Returns the size of its argument. The argument
x
can be a variable or a type. VAL(t,i)
- Returns the member of the type
t
whose ordinal value isi
.
Warning: Sets and their operations are not yet supported, so
GDB treats the use of procedures
INCL
andEXCL
as an error.
Next: M2 Constants, Previous: M2 Operators, Up: Modula-2 [Contents][Index]