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Use HALF_EVEN rounding mode for round()

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Add docs and tests for rounding.

 #KT-4900
This commit is contained in:
Ilya Gorbunov
2017-07-21 19:19:55 +03:00
parent 5e9e6d5951
commit d0b12e3872
3 changed files with 213 additions and 10 deletions
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libraries/stdlib/test/numbers/MathTest.kt
+56 -1
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@@ -148,9 +148,64 @@ class DoubleMathTest {
}
@Test fun rounding() {
TODO()
for (value in listOf(Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY, 0.0, 1.0, -10.0)) {
assertEquals(value, ceil(value))
assertEquals(value, floor(value))
assertEquals(value, truncate(value))
assertEquals(value, round(value))
}
val data = arrayOf( // v floor trunc round ceil
doubleArrayOf( 1.3, 1.0, 1.0, 1.0, 2.0),
doubleArrayOf(-1.3, -2.0, -1.0, -1.0, -1.0),
doubleArrayOf( 1.5, 1.0, 1.0, 2.0, 2.0),
doubleArrayOf(-1.5, -2.0, -1.0, -2.0, -1.0),
doubleArrayOf( 1.8, 1.0, 1.0, 2.0, 2.0),
doubleArrayOf(-1.8, -2.0, -1.0, -2.0, -1.0),
doubleArrayOf( 2.3, 2.0, 2.0, 2.0, 3.0),
doubleArrayOf(-2.3, -3.0, -2.0, -2.0, -2.0),
doubleArrayOf( 2.5, 2.0, 2.0, 2.0, 3.0),
doubleArrayOf(-2.5, -3.0, -2.0, -2.0, -2.0),
doubleArrayOf( 2.8, 2.0, 2.0, 3.0, 3.0),
doubleArrayOf(-2.8, -3.0, -2.0, -3.0, -2.0)
)
for ((v, f, t, r, c) in data) {
assertEquals(f, floor(v), "floor($v)")
assertEquals(t, truncate(v), "truncate($v)")
assertEquals(r, round(v), "round($v)")
assertEquals(c, ceil(v), "ceil($v)")
}
}
@Test fun roundingConversion() {
assertEquals(1L, 1.0.roundToLong())
assertEquals(1L, 1.1.roundToLong())
assertEquals(2L, 1.5.roundToLong())
assertEquals(3L, 2.5.roundToLong())
assertEquals(-2L, (-2.5).roundToLong())
assertEquals(-3L, (-2.6).roundToLong())
assertEquals(9223372036854774784, (9223372036854774800.0).roundToLong())
assertEquals(Long.MAX_VALUE, Double.MAX_VALUE.roundToLong())
assertEquals(Long.MIN_VALUE, (-Double.MAX_VALUE).roundToLong())
assertEquals(Long.MAX_VALUE, Double.POSITIVE_INFINITY.roundToLong())
assertEquals(Long.MIN_VALUE, Double.NEGATIVE_INFINITY.roundToLong())
assertFails { Double.NaN.roundToLong() }
assertEquals(1, 1.0.roundToInt())
assertEquals(1, 1.1.roundToInt())
assertEquals(2, 1.5.roundToInt())
assertEquals(3, 2.5.roundToInt())
assertEquals(-2, (-2.5).roundToInt())
assertEquals(-3, (-2.6).roundToInt())
assertEquals(2123456789, (2123456789.0).roundToInt())
assertEquals(Int.MAX_VALUE, Double.MAX_VALUE.roundToInt())
assertEquals(Int.MIN_VALUE, (-Double.MAX_VALUE).roundToInt())
assertEquals(Int.MAX_VALUE, Double.POSITIVE_INFINITY.roundToInt())
assertEquals(Int.MIN_VALUE, Double.NEGATIVE_INFINITY.roundToInt())
assertFails { Double.NaN.roundToInt() }
}
}