题目：
设计一个收银程序 checkCashRegister() ，其把购买价格(price)作为第一个参数 , 付款金额 (cash)作为第二个参数, 和收银机中零钱 (cid) 作为第三个参数.
cid 是一个二维数组，存着当前可用的找零.
当收银机中的钱不够找零时返回字符串 "Insufficient Funds". 如果正好则返回字符串 "Closed".
否则, 返回应找回的零钱列表,且由大到小存在二维数组中.
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1 function checkCashRegister(price, cash, cid) {
2 var change;
3 var sumCid;
4
5 // Here is your change, ma‘am.
6 var obj = {
7 penny: cid[0][1],
8 nickel: cid[1][1],
9 dime: cid[2][1],
10 quarter: cid[3][1],
11 one: cid[4][1],
12 five: cid[5][1],
13 ten: cid[6][1],
14 twenty: cid[7][1],
15 oneHundred:cid[8][1]
16 };
17
18 //购买价格(price), 付款金额 (cash), 收银机中零钱 (cid)
19 change = cash - price;
20 //console.log("typeof(change):", typeof(change)); //number
21 //console.log("change:", change);
22
23 sumCid =
24 obj.penny +
25 obj.nickel +
26 obj.dime +
27 obj.quarter +
28 obj.one +
29 obj.five +
30 obj.ten +
31 obj.twenty +
32 obj.oneHundred;
33
34 sumCid = Number(sumCid.toFixed(2)); //保留两位小数
35
36 //console.log(typeof(sumCid)); //number
37 //console.log("sumCid:", sumCid);
38
39 if (sumCid < change) {
40 //console.log("sumCid小于change！");
41 return "Insufficient Funds"; //余额不足
42 }
43 else if (sumCid === change) {
44 //console.log("sumCid等于change！");
45 return "Closed";
46 }
47 else {
48 // 1.零钱不够,返回余额不足
49 // 2.零钱足够,找回零钱
50 //console.log("sumCid大于change!");
51 overChange(change, cid, sumCid);
52 }
53 }
54
55 function overChange(change, arr, sumCid) {
56 var array = [];
57 var len = arr.length;
58
59 for (var i = len - 1; i >= 0; i--) {
60 if (arr[i][1] === 0) continue;
61
62 if (arr[i][1] < change) {
63 array.push(arr[i]);
64 change -= arr[i][1];
65 change = Number(change.toFixed(2));
66 //console.log("current change:", change);
67 }
68
69 else if (arr[i][1] > change) {
70 var x = arr[i][0]; // 取得零钱名称
71 //console.log("x:", x);
72 var y = 0;
73
74 switch(x) {
75 case "ONE HUNDRED":
76 y = Math.floor(change / 100) * 100;
77 break;
78 case "TWENTY":
79 y = Math.floor(change / 20) * 20;
80 break;
81 case "TEN":
82 y = Math.floor(change / 10) * 10;
83 break;
84 case "FIVE":
85 y = Math.floor(change / 5) * 5;
86 break;
87 case "ONE":
88 y = Math.floor(change / 1);
89 break;
90 case "QUARTER":
91 y = Math.floor(change / 0.25) * 0.25;
92 break;
93 case "DIME":
94 y = Math.floor(change / 0.10) * 0.10;
95 break;
96 case "NICKEL":
97 y = Math.floor(change / 0.05) * 0.05;
98 break;
99 case "PENNY":
100 y = Math.floor(change / 0.01) * 0.01;
101 break;
102 }
103
104 console.log(y);
105 console.log(sumCid - arr[i][1] < change);
106
107 if (y === 0 && sumCid - arr[i][1] < change) {
108 //console.log("Insufficient Funds");
109 return "Insufficient Funds";
110 }
111
112 else if (y === 0) {
113 continue;
114 }
115
116 else {
117 if (y < 1) {
118 y = y;
119 }
120 var array1 = [];
121 array1.push(arr[i][0]);
122 array1.push(y);
123 array.push(array1);
124 change -= y;
125 change = Number(change.toFixed(2));
126 //console.log("current change:", change);
127 }
128 }
129 }
130
131 if (change === 0) {
132 //console.log("array:", array);
133 return array;
134 }
135 else {
136 //console.log("Insufficient Funds");
137 return "Insufficient Funds";
138 }
139
140 }
141
142 checkCashRegister(3.26, 100.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]);
checkCashRegister(19.50, 20.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]) 应该返回一个数组.
checkCashRegister(19.50, 20.00, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) 应该返回一个字符串.
checkCashRegister(19.50, 20.00, [["PENNY", 0.50], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) 应该返回一个字符串.
checkCashRegister(19.50, 20.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]) 应该返回 [["QUARTER", 0.50]].
checkCashRegister(3.26, 100.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]) 应该返回 [["TWENTY", 60.00], ["TEN", 20.00], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.50], ["DIME", 0.20], ["PENNY", 0.04]].
checkCashRegister(19.50, 20.00, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) 应该返回 "Insufficient Funds".
checkCashRegister(19.50, 20.00, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1.00], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) 应该返回 "Insufficient Funds".
checkCashRegister(19.50, 20.00, [["PENNY", 0.50], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]) 应该返回 "Closed".
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