Tag Archives: ISBIT

CT_ISBIT

Posted on by vivaclipper 
 ISBIT()
 Tests the bits in a number
------------------------------------------------------------------------------
 Syntax

     ISBIT(<nLONG|cHexLONG>,[<nBitPos>]) --> lSet

 Arguments

     <nLONG|cHexLONG> Designates either a decimal number or hexadecimal
     digit string.

     <nBitPos>  Designates the bit number to test.  The value can lie in
     the range of 1 to 32.  The default is the least-significant bit.

 Returns

     When the designated bit is set, the function returns a result of .T..

 Description

     ISBIT() tests a particular bit within a numeric field, without having to
     mask it or do a comparison.

 Example

     Tests the BREAK bit in the line status register of the COM1 serial
     interface:

     IF ISBIT(COM_LSR(1), 5)
        ? "BREAK condition detected!"
     ENDIF

See Also: NUMAND() NUMNOT() NUMOR() NUMXOR() SETBIT()

 

Tools – Numbers/Bit Manipulation

Posted on by vivaclipper 
Introduction
BITTOC()     Converts position-dependent bits into characters
CELSIUS()    Converts a Fahrenheit temperature value into Celsius
CLEARBIT()   Clears one or more bits within a number to zero
CTOBIT()     Converts a character string into a bit pattern
CTOF()       Converts a special 8-byte string into a floating point number
CTON()       Converts a numeric string into a different base
EXPONENT()   Determines the exponent of a floating point number (base 2)
FAHRENHEIT() Converts a temperature value from Celsius into Fahrenheit
FTOC()       Converts a floating point number into a special 8-byte string
INFINITY()   Creates the largest number possible (21023)
INTNEG()     Converts an unsigned integer into a signed integer
INTPOS()     Converts a signed integer into an unsigned integer
ISBIT()      Tests the bits in a number
LTON()       Converts a logical value into a numeric value
MANTISSA()   Determines the mantissa of a floating point number (base2)
NTOC()       Converts numbers in a digit string into a different number base
NUMAND()     Performs a 16-bit "AND" of a list of numbers
NUMCOUNT()   Uses the internal CA-Clipper Tools counter
NUMHIGH()    Returns the higher value byte in a 16-bit number
NUMLOW()     Returns the lower value byte in a 16-bit number
NUMMIRR()    Mirrors 8-bit or 16-bit values
NUMNOT()     Performs a 16-bit "NOT" of a number
NUMOR()      Performs a 16-bit "OR" of a list of numbers
NUMROL()     Performs a 16-bit left rotation of a number
NUMXOR()     Performs a 16-bit "XOR" of two numbers
RAND()       Generates random numbers
RANDOM()     Generates random numbers
SETBIT()     Sets one or more bits in a number