Dart\u306e\u4e71\u6570\u751f\u6210\u306b\u3064\u3044\u3066\u8abf\u3079\u3066\u307f\u307e\u3057\u305f\u3002Math.random() \u3092\u4f7f\u3048\u3070\u826f\u3044\u3088\u3046\u3067\u3059\u304c\u3001\u81ea\u5206\u3067\u5b9f\u88c5\u3057\u305f\u65b9\u304c\u826f\u3044\u5834\u5408\u3082\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002
\n
\n\u30b5\u30a4\u30b3\u30ed\u304c\u308f\u304b\u308a\u3084\u3059\u3044\u3068\u601d\u3046\u306e\u3067\u30011\u304b\u30896\u307e\u3067\u306e\u4e71\u6570\u30921000\u56de\u751f\u6210\u3057\u3066\u3001\u305d\u308c\u305e\u308c\u304c\u3069\u308c\u304f\u3089\u3044\u767a\u751f\u3057\u305f\u306e\u304b\u3092\u30ab\u30a6\u30f3\u30c8\u3057\u3066\u307f\u307e\u3057\u305f\u3002RandIntImple1, RandIntImple2 \u306fDart\u306eMath.random()\u3092\u4f7f\u3063\u30660.0\u4ee5\u4e0a 0.1\u672a\u6e80\u306edouble\u578b\u5024\uff08API\u306b\u3088\u308b\u3068\u3001Returns a random double greater than or equal to 0.0 and less than 1.0.\uff09\u3092\u51fa\u3057\u3066\u304b\u3089\u3001\u305d\u306e\u5f8c\u306e\u8a08\u7b97\u3092\u5909\u3048\u3066\u3044\u307e\u3059\u3002RandIntImple3\u306f\u3088\u304f\u3042\u308b\u7dda\u5f62\u5408\u540c\u6cd5\u306b\u3088\u308b\u3082\u306e\u3067\u3001RandIntImple4\u306fxorshift\u306b\u3088\u308b\u3082\u306e\u3067\u3059\u3002RandIntImple3, RandIntImple4 \u306e\u8a08\u7b97\u306b\u306f\u6642\u9593\u304c\u304b\u304b\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\r\ninterface RandInt {\r\n int random();\r\n}\r\nclass RandIntImple1 implements RandInt {\r\n int min = 0;\r\n int max = 1;\r\n RandIntImple1() {\r\n }\r\n RandIntImple1.minmax(this.min, this.max);\r\n int random() {\r\n double r = Math.random() * (max - min + 1) + min;\r\n return r.toInt();\r\n }\r\n}\r\nclass RandIntImple2 extends RandIntImple1 implements RandInt {\r\n RandIntImple2.minmax(int min, int max) : super.minmax(min, max);\r\n int random() {\r\n double r = min + (Math.random() * max).floor();\r\n return r.toInt();\r\n }\r\n}\r\n\/\/ rand\r\nclass RandIntImple3 extends RandIntImple1 implements RandInt {\r\n RandIntImple3.minmax(int min, int max) : super.minmax(min, max);\r\n static num x = 1;\r\n void srand(num s) {\r\n x = s;\r\n }\r\n num rand() {\r\n x = x * 1103515245 + 12345;\r\n return x & 2147483647; \r\n }\r\n int random() {\r\n num r = rand();\r\n return (min + r) % max + min;\r\n }\r\n}\r\nclass RandIntImple4 extends RandIntImple1 implements RandInt {\r\n static num x = 123456789;\r\n static num y = 362436069;\r\n static num z = 521288629;\r\n static num w = 88675123; \r\n RandIntImple4.minmax(int min, int max) : super.minmax(min, max);\r\n void seed(num x0, num y0, num z0, num w0) {\r\n x = x0;\r\n y = y0;\r\n z = z0;\r\n w = w0;\r\n if (x+y+z+w <= 0) {\r\n x = 123456789;\r\n y = 362436069;\r\n z = 521288629;\r\n w = 88675123; \r\n }\r\n }\r\n int random() {\r\n num r = xor128();\r\n return (min + r) % max + min;\r\n }\r\n num xor128(){ \r\n num t; \r\n t = (x^(x<<11));\r\n x = y;\r\n y = z;\r\n z = w;\r\n w = (w^(w>>19))^(t^(t>>8));\r\n return w; \r\n }\r\n}\r\n\r\nvoid printRand(RandInt app) {\r\n List result = new List(7);\r\n for (int i=0 ; i<result.length ; i++) {\r\n result[i] = 0;\r\n }\r\n for (int i=0 ; i<10000 ; i++) {\r\n int x = app.random();\r\n result[x]++;\r\n }\r\n result.forEach((e) => print(e));\r\n int sum = 0;\r\n result.forEach((e) => sum += e);\r\n print(sum\/6);\r\n}\r\nvoid main() {\r\n printRand(new RandIntImple1.minmax(1, 6));\r\n print("-----");\r\n printRand(new RandIntImple2.minmax(1, 6));\r\n print("-----");\r\n RandIntImple3 rand3 = new RandIntImple3.minmax(1, 6);\r\n int seed = (new Date.now()).value;\r\n rand3.srand(seed);\r\n printRand(rand3);\r\n print("-----");\r\n printRand(new RandIntImple4.minmax(1, 6));\r\n print("-----");\r\n RandIntImple4 rand4 = new RandIntImple4.minmax(1, 6);\r\n rand4.seed(1, 10, 100, 1000);\r\n printRand(rand4);\r\n}\r\n<\/pre>\n