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Mai Văn Thắng Beginner
Asked At: 1659667498000 In: Kotlin
Mai Văn Thắng Beginner Asked At: 1659667498000 In: Kotlin
phép cộng trong Kotlin 
fun main() {
  val c = 0.2 + 0.2.2
  val d = 3.5 + 4.3 + 5.1

  println(d) // trả về 12.8999999999999
  println(c) // trả về 0.42000000000004
}
Kết quả này đúng hay sai ạ?
  • 1 Answer(s)
  • 1422 Views
  • Answer
kotlin floating point
Remain: 5
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monkey Enlightened
Added an answer at: 1659668531000
monkey Enlightened
Added an answer at: 1659668531000
IEEE 754
nên nó sẽ không thể nào đảm bảo chính xác từng dấu phẩy động được. Muốn chính xác dấu phẩy động em phải dùng BigDecimal, ví dụ: 
fun main() {
    val c = BigDecimal("0.2") + BigDecimal("0.22")
    val d = BigDecimal("3.5") + BigDecimal("4.3") + BigDecimal("5.1")

    println(d) // trả về 12.9
    println(c) // trả về 0.42
}
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em cảm ơn anh đã giúp em , mấy hôm nay em nghĩ mãi không thông 😂
  –  Mai Văn Thắng 1659669788000
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