Improved rounding accuracy on test-to-float conversions.

FossilOrigin-Name: 699b792c6a0e989994549959b11ec1bfad8bbd92

test/atof1.test

@@ -0,0 +1,36 @@
+# 2012 June 18
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# 
+# Tests of the sqlite3AtoF() function.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+expr srand(1)
+for {set i 1} {$i<10000} {incr i} {
+  do_test 1.$i {
+    set pow [expr {int((rand()-0.5)*100)}]
+    set x [expr {pow((rand()-0.5)*2*rand(),$pow)}]
+    set xf [format %.45e $x]
+    set y [db eval "SELECT $xf=\$x"]
+    if {!$y} {
+      puts -nonewline \173[db eval "SELECT real2hex($xf), real2hex(\$x)"]\175
+      db eval "SELECT $xf+0.0 AS a, \$x AS b" {
+        puts [format "\n%.60e\n%.60e\n%.60e" $x $a $b]
+      }
+    }
+    set y
+  } {1}
+}
+
+
+finish_test