pTAL Reference Manual (H06.08+)

Built-In Routines

HP pTAL Reference Manual—523746-006

15-32

$COMP

$COMP returns the one’s complement of its argument.

int-expression

is an expression whose value is an INT or INT(32) value.

The data type of the expression returned by $COMP is the same as the data type of its

argument.

Example 15-18. $CHECKSUM Routine

LITERAL buffer_len = 100;

INT c_sum_val;

INT .EXT buffer1 [ 0:buffer_len - 1 ];

INT .EXT buffer2 [ 0:buffer_len - 1 ];

buffer1 ':=' [%H0123, %H4567, %H89AB];

c_sum_val:= 3;

$CHECKSUM(c_sum_val, @buffer1, buffer_len);

! Value of c_sum_val is now %HCDEF

! Checksum buffer2 in same checksum word as buffer1

$CHECKSUM(c_sum_val, @buffer2, buffer_len);

! c_sum_val now has the combined checksum of buffer1 & buffer2

pTAL privileged procedure No

Can be executed only by privileged procedures No

Sets condition code No

Sets $CARRY No

Sets $OVERFLOW No

Example 15-19. $COMP Routine

INT i;

INT(32) j;

i := $COMP(i);

j := $COMP(j);

( )

VST077.vsd

$COMP

int-expression