Scientific Operations



ECVT(III)                    4/30/73                    ECVT(III)



NAME
     ecvt, fcvt - output conversion

SYNOPSIS
     jsr  pc,ecvt

     jsr  pc,fcvt

     char *ecvt(value, ndigit, decpt, sign)
     double value;
     int ndigit, *decpt, *sign;

     char *fcvt(value, ndigit, decpt, sign)
     ...

DESCRIPTION
     Ecvt is called with a floating point number in fr0.

     On  exit,  the  number  has  been converted into a string of
     ascii digits in a buffer pointed to by r0.   The  number  of
     digits produced is controlled by a global variable _ndigits.

     Moreover, the position of the decimal point is contained  in
     r2:  r2=0  means  the  d.p.  is  at the left hand end of the
     string of digits; r2>0 means the d.p. is within  or  to  the
     right of the string.

     The  sign  of  the number is indicated by r1 (0 for +; 1 for
     -).

     The low order digit has suffered decimal rounding (i. e. may
     have been carried into).

     From  C, the value is converted and a pointer to a null-ter-
     minated string of ndigit digits is returned.   The  position
     of  the  decimal  point  is  stored indirectly through decpt
     (negative means to the left of the returned digits).  If the
     sign  of the result is negative, the word pointed to by sign
     is non-zero, otherwise it is zero.

     Fcvt is identical to ecvt, except  that  the  correct  digit
     been  rounded  for  F-style  output  of the number of digits
     specified by _ndigits.

SEE ALSO
     printf(III)

BUGS









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