Absolute Value and Sign Transfer

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─────Absolute Value and Sign Transfer───────────────────────────────────────
 
     ABS, IABS, DABS, CABS, and CDABS return the absolute value of their
     arguments. For a complex number, the absolute value equals
 
     (real**2 + imag**2)**(1/2)
 
     For two arguments (genA, genB), the intrinsic functions SIGN, ISIGN,
     and DSIGN return |genA| if genB is greater than or equal to zero,
     and -|genA| if genB is less than zero.
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