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Mai Văn Thắng Beginner
Asked: 1659667498000 In: Kotlin
Mai Văn Thắng Beginner Asked: 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?

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  • Answer
kotlin floating point
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monkey Beginner
Added an answer at: 1659668531000
monkey Beginner
Added an answer at: 1659668531000
Cái này em code đúng rồi nhé, vì bản chất máy tính không có số thực nó chỉ có nhị phân 1 0 thôi, nên nó cần biểu diễn số thực thông qua chuẩn ví dụ 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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