xref: /sqlite-3.40.0/test/atof1.test (revision 962f9669) 
1# 2012 June 18
2#
3# The author disclaims copyright to this source code.  In place of
4# a legal notice, here is a blessing:
5#
6#    May you do good and not evil.
7#    May you find forgiveness for yourself and forgive others.
8#    May you share freely, never taking more than you give.
9#
10#***********************************************************************
11#
12# Tests of the sqlite3AtoF() function.
13#
14
15set testdir [file dirname $argv0]
16source $testdir/tester.tcl
17
18if {![info exists __GNUC__] || [regexp arm $tcl_platform(machine)]} {
19  finish_test
20  return
21}
22
23expr srand(1)
24for {set i 1} {$i<20000} {incr i} {
25  set pow [expr {int((rand()-0.5)*100)}]
26  set x [expr {pow((rand()-0.5)*2*rand(),$pow)}]
27  set xf [format %.32e $x]
28
29  # Verify that text->real conversions get exactly same ieee754 floating-
30  # point value in SQLite as they do in TCL.
31  #
32  do_test atof1-1.$i.1 {
33    set y [db eval "SELECT $xf=\$x"]
34    if {!$y} {
35      puts -nonewline \173[db eval "SELECT real2hex($xf), real2hex(\$x)"]\175
36      db eval "SELECT $xf+0.0 AS a, \$x AS b" {
37        puts [format "\n%.60e\n%.60e\n%.60e" $x $a $b]
38      }
39    }
40    set y
41  } {1}
42
43  # Verify that round-trip real->text->real conversions using the quote()
44  # function preserve the bits of the numeric value exactly.
45  #
46  do_test atof1-1.$i.2 {
47    set y [db eval {SELECT $x=CAST(quote($x) AS real)}]
48    if {!$y} {
49      db eval {SELECT real2hex($x) a, real2hex(CAST(quote($x) AS real)) b} {}
50      puts "\nIN:    $a $xf"
51      puts [format {QUOTE: %16s %s} {} [db eval {SELECT quote($x)}]]
52      db eval {SELECT CAST(quote($x) AS real) c} {}
53      puts "OUT:   $b [format %.32e $c]"
54    }
55    set y
56  } {1}
57}
58
59
60finish_test
61