| // WITH_STDLIB |
| import kotlin.math.* |
| |
| private fun signOf(x: Double): Int { |
| if (x.isNaN()) return 0 |
| if (x == 0.0) return if (1.0 / x == Double.NEGATIVE_INFINITY) -1 else 1 |
| return if (x > 0) 1 else -1 |
| } |
| |
| fun box(): String { |
| val a = 1.234 |
| if (!((a % 0.0).isNaN())) return "fail1" |
| if (!((a.mod(0.0)).isNaN())) return "fail2" |
| |
| val r1 = 10.125 % -0.5 |
| if (signOf(r1) != signOf(10.125)) return "fail3" |
| |
| val r2 = (-10.125) % 0.5 |
| if (signOf(r2) != signOf(-10.125)) return "fail4" |
| |
| val m1 = 10.125.mod(-0.5) |
| if (signOf(m1) != signOf(-0.5)) return "fail5" |
| val m2 = (-10.125).mod(0.5) |
| if (signOf(m2) != signOf(0.5)) return "fail6" |
| |
| fun expectedMod(x: Double, y: Double): Double { |
| val rem = x % y |
| return if (signOf(rem) == signOf(y)) rem else rem + y |
| } |
| for ((x, y) in listOf( |
| 10.125 to 0.5, 10.125 to -0.5, -10.125 to 0.5, -10.125 to -0.5, |
| 7.3 to 0.4, -7.3 to 0.4, 7.3 to -0.4, -7.3 to -0.4 |
| )) { |
| val got = x.mod(y) |
| val exp = expectedMod(x, y) |
| if (!(got == exp || (got.isNaN() && exp.isNaN()))) |
| return "fail" |
| } |
| return "OK" |
| } |
