Scala：slice（）未按预期方式执行

-1

我正在写一小段代码，它将遍历一个1000位数的数字，每个步骤需要13位数字。对于例如在第一次迭代中，它应该在地点0-13处取数字，在下一次迭代中它应该在地点1-14处取数字，依此类推。这是我的代码，但当我遍历大数时，我的切片越来越小。我想每次从原始字符串中分割13位数字。我究竟做错了什么？Scala：slice（）未按预期方式执行

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) 
    }

输出如下，并在每个切片后丢弃数字。我究竟做错了什么？

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 .....

来源

2016-07-09 Jimit Raithatha

您误解了切片参数。第二个是绝对结束指数，而不是切片长度。看看Scaladoc吧。 – cchantep

看起来像你希望使用'.sliding（13）' –

-2

谢谢，滑动完美。

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

来源

2016-07-09 01:51:19

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

Scala：slice（）未按预期方式执行

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