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Using Compaq COBOL in the Alpha Common Language Environment
13.6 Examples (OpenVMS)
Example 13–5 Sample Run of CALLTIME (OpenVMS)
CALL SYS$ASCTIM
DATE/TIME 11-AUG-2000 09:34:33.45
LENGTH OF RETURNED = 0023
The following example shows how to call the procedure that enables and disables
detection of floating-point underflow (LIB$FLT_UNDER) from a COBOL program.
The format of the LIB$FLT_UNDER procedure is explained in the OpenVMS
RTL Library (LIB$) Manual.
WORKING-STORAGE SECTION.
01 NEW-SET PIC S9(9) USAGE IS COMP.
01 OLD-SET PIC S9(9) USAGE IS COMP.
.
.
.
PROCEDURE DIVISION.
.
.
.
P0.
MOVE 1 TO NEW-SET.
CALL "LIB$FLT_UNDER" USING NEW-SET GIVING OLD-SET.
The following example shows how to call the procedure that finds the first clear
bit in a given bit field (LIB$FFC). This procedure returns a COMP longword
condition value, represented in the example as RETURN-STATUS.
WORKING-STORAGE SECTION.
01 START-POS PIC S9(9) USAGE IS COMP VALUE 0.
01 SIZ PIC S9(9) USAGE IS COMP VALUE 32.
01 BITS PIC S9(9) USAGE IS COMP VALUE 0.
01 POS PIC S9(9) USAGE IS COMP VALUE 0.
01 RETURN-STATUS PIC S9(9) USAGE IS COMP.
.
.
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PROCEDURE DIVISION.
.
.
.
CALL "LIB$FFC" USING START-POS,
SIZ,
BITS,
POS
GIVING RETURN-STATUS.
IF RETURN-STATUS IS FAILURE
THEN GO TO error-proc.
The following example uses LIB$SET_SYMBOL to set a value for a DCL symbol
and shows the use of LIB$K_* symbols for arguments and LIB$_* symbols for
return status values.
Using Compaq COBOL in the Alpha Common Language Environment 13–21