Scala：slice（）未按預期方式執行

-1

我正在寫一小段代碼，它將遍歷一個1000位數的數字，每個步驟需要13位數字。對於例如在第一次迭代中，它應該在地點0-13處取數字，在下一次迭代中它應該在地點1-14處取數字，依此類推。這是我的代碼，但當我遍歷大數時，我的切片越來越小。我想每次從原始字符串中分割13位數字。我究竟做錯了什麼？Scala：slice（）未按預期方式執行

val largeNumber = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450" 
var current13Digits = "" 

for (iterator <- 0 to (largeNumber.length-13)) 
    { 
      println("CURRENT VALUE OF ITERATOR IS " + iterator) 
      current13Digits = largeNumber.slice(iterator,13) 
      println("CURRENT 13 DIGITS ARE " + current13Digits) 
    }

輸出如下，並在每個切片後丟棄數字。我究竟做錯了什麼？

CURRENT VALUE OF ITERATOR IS 0 
CURRENT 13 DIGITS ARE 7316717653133 
CURRENT VALUE OF ITERATOR IS 1 
CURRENT 13 DIGITS ARE 316717653133 
CURRENT VALUE OF ITERATOR IS 2 
CURRENT 13 DIGITS ARE 16717653133 
CURRENT VALUE OF ITERATOR IS 3 
CURRENT 13 DIGITS ARE 6717653133 
CURRENT VALUE OF ITERATOR IS 4 
CURRENT 13 DIGITS ARE 717653133 
CURRENT VALUE OF ITERATOR IS 5 
CURRENT 13 DIGITS ARE 17653133 
CURRENT VALUE OF ITERATOR IS 6 
CURRENT 13 DIGITS ARE 7653133 
CURRENT VALUE OF ITERATOR IS 7 
CURRENT 13 DIGITS ARE 653133 
CURRENT VALUE OF ITERATOR IS 8 
CURRENT 13 DIGITS ARE 53133 
CURRENT VALUE OF ITERATOR IS 9 
CURRENT 13 DIGITS ARE 3133 
CURRENT VALUE OF ITERATOR IS 10 
CURRENT 13 DIGITS ARE 133 
CURRENT VALUE OF ITERATOR IS 11 
CURRENT 13 DIGITS ARE 33 
CURRENT VALUE OF ITERATOR IS 12 
CURRENT 13 DIGITS ARE 3 
CURRENT VALUE OF ITERATOR IS 13 
CURRENT 13 DIGITS ARE 
CURRENT VALUE OF ITERATOR IS 14 
CURRENT 13 DIGITS ARE 
CURRENT VALUE OF ITERATOR IS 15 
CURRENT 13 DIGITS ARE .....

來源

2016-07-09 Jimit Raithatha

您誤解了切片參數。第二個是絕對結束指數，而不是切片長度。看看Scaladoc吧。 – cchantep

看起來像你希望使用'.sliding（13）' –

-2

謝謝，滑動完美。

val current13Digits = largeNumber.sliding(13) 
while(current13Digits.hasNext) 
    { 
    current13DigitsAsString = current13Digits.next() 
    println("CURRENT 13 DIGITS ARE " + current13DigitsAsString 
    ... 
    }

來源

2016-07-09 01:51:19

'largeNumber.sliding（13）.foreach（s => println（「CURRENT 13 DIGITS ARE」+ s））' – dhg

Scala：slice（）未按預期方式執行

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