SML構建列表

代碼有線事情是這樣：SML構建列表

- fun foo(a : int, b :int) = 
= if a > b 
= then [] 
= else [a] @ foo(a+1, b) 
= ; 
val foo = fn : int * int -> int list 
- foo(1, 100); 
val it = [1,2,3,4,5,6,7,8,9,10,11,12,...] : int list

功能打算從一個構造的列表至b，如果是大於或小於B以下，否則一個空列表將被創建。當我分別執行函數foo與參數綁定到 1和100 A和B，我得到了有趣的結果：

[1,2,3,4,5,6,7,8,9,10,11,12,...]

什麼的......這裏是什麼意思？

來源

2013-01-23 Haiyuan Zhang

可能的重複[請參見SML完整列表]（http://stackoverflow.com/questions/14412439/see-sml-full-list） – CoolBeans

這只是意味着您的SML系統（SML-NJ，我假設）已經省略了部分輸出以防止顯示過長。這是一個不同的SML系統，莫斯科ML：

Moscow ML version 2.01 (January 2004) 
Enter `quit();' to quit. 
- fun foo(a, b) = 
    if a > b 
    then [] 
    else [a] @ foo(a+1, b) 
; 
> val foo = fn : int * int -> int list 
- foo(1, 100); 
> val it = 
    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 
    22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 
    40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 
    58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 
    76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 
    94, 95, 96, 97, 98, 99, 100] : int list 
- 
- foo(1, 1000); 
> val it = 
    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 
    22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 
    40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 
    58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 
    76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 
    94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 
    110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 
    125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 
    140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 
    155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 
    170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 
    185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 
    200, ...] : int list 
-

來源

2013-01-23 15:13:31

的SML解釋器有一些內部的默認設置，告訴它多少打印邁克爾也顯示。但是，您可以通過設置更高的值來控制這些值，然後再打印更多值。有關詳細信息，請參見此answer

來源

2013-01-23 15:15:16

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