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45 lines
1.0 KiB
Plaintext
45 lines
1.0 KiB
Plaintext
NAME
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btrunc - truncate a value to a number of binary places
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SYNOPSIS
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btrunc(x [,plcs])
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TYPES
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x real
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plcs integer, defaults to zero
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return real
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DESCRIPTION
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Truncate x to plcs binary places, rounding if necessary towards zero,
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i.e. btrunc(x, plcs) is a multiple of 2^-plcs and the remainder
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x - btrunc(x, plcs) is either zero or has the same sign as x and
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absolute value less than 2^-plcs. Here plcs may be positive, zero or
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negative.
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Except that it is defined only for real x, btrunc(x, plcs) is equivalent
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to bround(x, plcs, 2). btrunc(x,0) and btrunc(x) are equivalent to
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int(x).
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EXAMPLE
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> print btrunc(pi()), btrunc(pi(), 10)
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3 3.140625
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> print btrunc(3.3), btrunc(3.7), btrunc(3.3, 2), btrunc(3.7, 2)
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3 3 3.25 3.5
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> print btrunc(-3.3), btrunc(-3.7), btrunc(-3.3, 2), btrunc(-3.7, 2)
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-3 -3 -3.25 -3.5
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> print btrunc(55.123, -4), btrunc(-55.123, -4)
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48 -48
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LIMITS
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abs(j) < 2^31
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LIBRARY
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NUMBER *qbtrunc(NUMBER *x, *j)
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SEE ALSO
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bround, int, round, trunc
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