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/*
* Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4428772
* @summary Testing recognition of "NaN" and "Infinity" strings
* @author Joseph D. Darcy
*/
public class NaNInfinityParsing {
/*
* Regression tests for:
* 4428772 -- Establish invariant for Float & Double classes and
* their string representations
*
* Added capability for parse{Float, Double} and related methods
* to recognize "NaN" and "Infinity" strings so that
* parseFloat(toString(d)) will always return the original
* floating-point value.
*/
static String NaNStrings[] = {
"NaN",
"+NaN",
"-NaN"
};
static String infinityStrings[] = {
"Infinity",
"+Infinity",
"-Infinity",
};
static String invalidStrings[] = {
"+",
"-",
"@",
"N",
"Na",
"Nan",
"NaNf",
"NaNd",
"NaNF",
"NaND",
"+N",
"+Na",
"+Nan",
"+NaNf",
"+NaNd",
"+NaNF",
"+NaND",
"-N",
"-Na",
"-Nan",
"-NaNf",
"-NaNd",
"-NaNF",
"-NaND",
"I",
"In",
"Inf",
"Infi",
"Infin",
"Infini",
"Infinit",
"InfinitY",
"Infinityf",
"InfinityF",
"Infinityd",
"InfinityD",
"+I",
"+In",
"+Inf",
"+Infi",
"+Infin",
"+Infini",
"+Infinit",
"+InfinitY",
"+Infinityf",
"+InfinityF",
"+Infinityd",
"+InfinityD",
"-I",
"-In",
"-Inf",
"-Infi",
"-Infin",
"-Infini",
"-Infinit",
"-InfinitY",
"-Infinityf",
"-InfinityF",
"-Infinityd",
"-InfinityD",
"NaNInfinity",
"InfinityNaN",
"nan",
"infinity"
};
public static void main(String [] argv) throws Exception {
int i;
float d;
// Test valid NaN strings
for(i = 0; i < NaNStrings.length; i++) {
if(!Float.isNaN(d=Float.parseFloat(NaNStrings[i]))) {
throw new RuntimeException("NaN string ``" + NaNStrings[i]
+ "'' did not parse as a NaN; returned " +
d + " instead.");
}
}
// Test valid Infinity strings
for(i = 0; i < infinityStrings.length; i++) {
if(!Float.isInfinite(d=Float.parseFloat(infinityStrings[i]))) {
throw new RuntimeException("Infinity string ``" +
infinityStrings[i] +
"'' did not parse as infinity; returned " +
d + "instead.");
}
// check sign of result
boolean negative = (infinityStrings[i].charAt(0) == '-');
if(d != (negative?Float.NEGATIVE_INFINITY:
Float.POSITIVE_INFINITY))
throw new RuntimeException("Infinity has wrong sign;" +
(negative?"positive instead of negative.":
"negative instead of positive."));
}
// Test almost valid strings
for(i = 0; i < invalidStrings.length; i++) {
try {
float result;
d = Float.parseFloat(invalidStrings[i]);
throw new RuntimeException("Invalid string ``" +
invalidStrings[i]
+"'' parsed as " + d + ".");
}
catch(NumberFormatException e) {
// expected
}
}
}
}
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