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WSupported on Windows
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USupported on Unix
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VSupported on OpenVMS
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NSupported in Synergy .NET
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status = %BIT_IS_CLR(bit, value)
Return value
status
One of the following values: (n)
1 = The bit is clear.
0 = The bit is set.
Arguments
bit
The number of the bit to be evaluated. (n)
value
The value whose binary representation contains the bit to be evaluated. (n)
Discussion
%BIT_IS_CLR evaluates a bit value in the binary representation of a value.
Bit numbering is zero-based. Bit can be 0 through 63 (or 31 on 32-bit systems), corresponding to values 1 through 8000000000000000 (hexadecimal).
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We recommend using bitwise Boolean operators rather than the %BIT_IS_CLR and %BIT_IS_SET functions. |
See also
Examples
The following example evaluates bit number 2 in the binary representation of 20:
%bit_is_clr(2,20)
Since the binary representation of 20 is 10100, and bit number 2 is actually the third bit from the right, this call to %BIT_IS_CLR returns a value of zero.
The example below translates bit flags and displays their values to the terminal.
subroutine show_bflags”
a_bit_flags ,n ;Bit positions
.define PUBLIC_BIT ,4
.define DOMESTIC_BIT ,5
.define LESS50_BIT ,6
.define VMAIL_BIT ,7
proc
xcall showit("Public company?",
& %bit_is_clr(PUBLIC_BIT, a_bit_flags))
xcall showit("Domestic sales only?",
& %bit_is_clr(DOMESTIC_BIT, a_bit_flags))
xcall showit("Less than 50 employees?",
& %bit_is_clr(LESS50_BIT, a_bit_flags))
xcall showit("Voice mail system?",
& %bit_is_clr(VMAIL_BIT, a_bit_flags))
return
endsubroutine
subroutine showit
a_txt ,a ;Text to display
a_set ,n ;1 = set, 0 = not set
record
yn ,a1 ;Y or N
proc
if (a_set) then
yn = 'N'
else
yn = 'Y'
display(TTCHN, a_txt, " (Y/N) ", yn)
return
endsubroutine
