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* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
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* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
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/*
* @ test
* @ bug 4916097
* @ summary Some exponent over / undeflow tests for the pow method
* @ author Joseph D . Darcy
*/
import java.math.*;
public class PowTests {
static int zeroAndOneTests() {
int failures = 0 ;
BigDecimal[][] testCases = {
{BigDecimal.valueOf(0 , Integer.MAX_VALUE), new BigDecimal(0 ), BigDecimal.valueOf(1 , 0 )},
{BigDecimal.valueOf(0 , Integer.MAX_VALUE), new BigDecimal(1 ), BigDecimal.valueOf(0 , Integer.MAX_VALUE)},
{BigDecimal.valueOf(0 , Integer.MAX_VALUE), new BigDecimal(2 ), BigDecimal.valueOf(0 , Integer.MAX_VALUE)},
{BigDecimal.valueOf(0 , Integer.MAX_VALUE), new BigDecimal(999999999 ), BigDecimal.valueOf(0 , Integer.MAX_VALUE)},
{BigDecimal.valueOf(0 , Integer.MIN_VALUE), new BigDecimal(0 ), BigDecimal.valueOf(1 , 0 )},
{BigDecimal.valueOf(0 , Integer.MIN_VALUE), new BigDecimal(1 ), BigDecimal.valueOf(0 , Integer.MIN_VALUE)},
{BigDecimal.valueOf(0 , Integer.MIN_VALUE), new BigDecimal(2 ), BigDecimal.valueOf(0 , Integer.MIN_VALUE)},
{BigDecimal.valueOf(0 , Integer.MIN_VALUE), new BigDecimal(999999999 ), BigDecimal.valueOf(0 , Integer.MIN_VALUE)},
{BigDecimal.valueOf(1 , Integer.MAX_VALUE), new BigDecimal(0 ), BigDecimal.valueOf(1 , 0 )},
{BigDecimal.valueOf(1 , Integer.MAX_VALUE), new BigDecimal(1 ), BigDecimal.valueOf(1 , Integer.MAX_VALUE)},
{BigDecimal.valueOf(1 , Integer.MAX_VALUE), new BigDecimal(2 ), null }, // overflow
{BigDecimal.valueOf(1 , Integer.MAX_VALUE), new BigDecimal(999999999 ), null }, // overflow
{BigDecimal.valueOf(1 , Integer.MIN_VALUE), new BigDecimal(0 ), BigDecimal.valueOf(1 , 0 )},
{BigDecimal.valueOf(1 , Integer.MIN_VALUE), new BigDecimal(1 ), BigDecimal.valueOf(1 , Integer.MIN_VALUE)},
{BigDecimal.valueOf(1 , Integer.MIN_VALUE), new BigDecimal(2 ), null }, // underflow
{BigDecimal.valueOf(1 , Integer.MIN_VALUE), new BigDecimal(999999999 ), null }, // underflow
};
for (BigDecimal[] testCase: testCases) {
int exponent = testCase[1 ].intValueExact();
BigDecimal result;
try {
result = testCase[0 ].pow(exponent);
if (!result.equals(testCase[2 ]) ) {
failures++;
System.err.println("Unexpected result while raising " +
testCase[0 ] +
" to the " + exponent + " power; expected " +
testCase[2 ] + ", got " + result + "." );
}
} catch (ArithmeticException e) {
if (testCase[2 ] != null ) {
failures++;
System.err.println("Unexpected exception while raising " + testCase[0 ] +
" to the " + exponent + " power." );
}
}
}
return failures;
}
public static void main(String argv[]) {
int failures = 0 ;
failures += zeroAndOneTests();
if (failures > 0 ) {
throw new RuntimeException("Incurred " + failures +
" failures while testing pow methods." );
}
}
}
Messung V0.5 in Prozent C=94 H=96 G=94
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-11)
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