pTAL Reference Manual (H06.08+)

Statements

HP pTAL Reference Manual—523746-006

12-9

Bit-Deposit Assignment

The bit deposit form of the assignment statement lets you assign a value to an

individual bit or to a group of sequential bits.

variable

is the identifier of a STRING or INT variable, but not an UNSIGNED(1-16) variable.

variable can be the identifier of a simple variable, array element, or simple

pointer (inside or outside a structure).

left-bit

is an INT constant that specifies the leftmost bit of the bit deposit field.

For STRING variables, specify a bit number in the range 8 through 15. Bit 8 is the

leftmost bit in a STRING variable; bit 15 is the rightmost bit.

right-bit

is an INT constant specifying the rightmost bit of the bit deposit field. right-bit

must be equal to or greater than left-bit.

For STRING variables, specify a bit number in the range 8 through 15. Bit 8 is the

leftmost bit in a STRING variable; bit 15 is the rightmost bit.

expression

is an INT arithmetic or conditional expression, with or without a bit field

specification.

The bit deposit field is on the left side of the assignment operator (:=). The bit deposit

assignment changes only the bit deposit field. If the value on the right side has more

bits than the bit deposit field, the system ignores the excess high-order bits when

making the assignment.

Specify the variable/bit-field construct with no intervening spaces as shown:

myvar.<0:5>

Do not use bit deposit fields to pack data. Instead, declare an UNSIGNED variable and

specify the appropriate number of bits in the bit field.

variable

. <

left-bit

right-bit

expression

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