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subroutine getnum (nchars,line,xnum,xnumsngl)
c******************************************************************************
c this routine gets a double precision number 'xnum' and its
c equivalent single precision number 'xnumsngl' from screen input;
c if a non-number is typed in, the user will be queried again
c******************************************************************************
implicit real*8 (a-h,o-z)
real*8 xnum
real*4 xnumsngl
integer line
xnum = -9999.
1 call getasci (nchars,line)
if (nchars .lt. 0) return
call number (nchars,line,xnum)
if (xnum .eq. -9999.) go to 1
xnumsngl = sngl(xnum)
return
end
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