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阶乘计算优化

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neko
2020-09-28 14:28:55 +08:00
committed by GitHub
parent 870ea9a329
commit b06d499279
1 changed files with 6 additions and 0 deletions
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6
hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
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@@ -241,10 +241,16 @@ public class NumberUtilTest {
long factorial = NumberUtil.factorial(0); long factorial = NumberUtil.factorial(0);
Assert.assertEquals(1, factorial); Assert.assertEquals(1, factorial);
Assert.assertEquals(1L, NumberUtil.factorial(1));
Assert.assertEquals(1307674368000L, NumberUtil.factorial(15));
Assert.assertEquals(2432902008176640000L, NumberUtil.factorial(20));
factorial = NumberUtil.factorial(5, 0); factorial = NumberUtil.factorial(5, 0);
Assert.assertEquals(120, factorial); Assert.assertEquals(120, factorial);
factorial = NumberUtil.factorial(5, 1); factorial = NumberUtil.factorial(5, 1);
Assert.assertEquals(120, factorial); Assert.assertEquals(120, factorial);
Assert.assertEquals(2432902008176640000L, NumberUtil.factorial(20, 0));
} }
@Test @Test