Clears one or more bits within a number to zero

        [...<nBitPos32>]) -->  nNewValue


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

     <nBitPos32>  Designates the bit numbers to delete.


     CLEARBIT() returns a value in which the designated bits are cleared.


     CLEARBIT() resets particular bits within a field to change something
     like a serial port register.  In contrast to NUMAND(), the bit numbers
     are given and do not need to be converted beforehand.  The value 1
     represents the bit with the lowest value, and the value 32, the bit with
     the highest value.


     .  An invalid parameter returns a result of -1.


     Bits 3, 4, and 6 are cleared in a bit pattern:

     nBitPattern  := 255
     nBitPattern  := CLEARBIT(nBitPattern, 3, 4, 6)   // Result:  211



Tools – Numbers/Bit Manipulation

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