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Commit 686a18ac authored by rtoy's avatar rtoy
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Fix for Trac ticket #1.

Instead of having scale-exponent scale the number and using the scaled
number for printing, have flonum-to-string scale the number for us.
There is no loss in precision in flonum-to-string, so we don't have
round-off errors in printing the number.  This means (format nil "~E"
1.234567890123456789d4) is printed as "1.2345678901234567d+4" instead
of "1.2345678901234565d+0".  Then prin1 and ~E both call
flonum-to-digits with exactly the same number, so prin1 and ~E should
have the same printed result.

These tests pass:

(assert (string= (format nil "~9,4,,-7E" pi) ".00000003d+8"))
(assert (string= (format nil "~9,4,,-5E" pi) ".000003d+6"))
(assert (string= (format nil "~5,4,,7E" pi) "3141600.d-6"))
(assert (string= (format nil "~11,4,,3E" pi) "  314.16d-2"))
(assert (string= (format nil "~11,4,,5E" pi) "  31416.d-4"))
(assert (string= (format nil "~11,4,,0E" pi) "  0.3142d+1"))
(assert (string= (format nil "~9,,,-1E" pi) ".03142d+2"))
(assert (string= (format nil "~,,,-2E" pi) "0.003141592653589793d+3"))
(assert (string= (format nil "~,,,2E" pi) "31.41592653589793d-1"))
(assert (string= (format nil "~E" pi) "3.141592653589793d+0"))
(assert (string= (format nil "~9,5,,-1E" pi) ".03142d+2"))
(assert (string= (format nil "~11,5,,-1E" pi) " 0.03142d+2"))
(assert (string= (format nil "~G" pi) "3.141592653589793    "))
(assert (string= (format nil "~9,5G" pi) "3.1416    "))
(assert (string= (format nil "|~13,6,2,7E|" pi) "| 3141593.d-06|"))
(assert (string= (format nil "~9,3,2,0,'%E" pi) "0.314d+01"))
(assert (string= (format nil "~9,0,6f" pi) " 3141593."))
(assert (string= (format nil "~6,2,1,'*F" pi) " 31.42"))
(assert (string= (format nil "~6,2,1,'*F" (* 100 pi)) "******"))
(assert (string= (format nil "~9,3,2,-2,'%@E" pi) "+.003d+03"))
(assert (string= (format nil "~10,3,2,-2,'%@E" pi) "+0.003d+03"))
(assert (string= (format nil "~15,3,2,-2,'%,'=@E" pi) "=====+0.003d+03"))
(assert (string= (format nil "~9,3,2,-2,'%E" pi) "0.003d+03"))
(assert (string= (format nil "~8,3,2,-2,'%@E" pi) "%%%%%%%%"))

(assert (string= (format nil "~g" 1e0) "1.    "))
(assert (string= (format nil "~g" 1.2d40) "12000000000000000000000000000000000000000.    "))

(assert (string= (format nil "~e" 0) "0.0e+0"))
(assert (string= (format nil "~e" 0d0) "0.0d+0"))
(assert (string= (format nil "~9,,4e" 0d0) "0.0d+0000"))
(assert (string= (format nil "~E" 1.234567890123456789d4) "1.2345678901234567d+0"))
parent 151a4a9d
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