十进制是已知的数值 第一种方法: <script type="text/javascript"> var num=2148140545; var str=num.toString("2");//转为二进制 var str1=parseInt(str.substring(0,8),2); /*parseInt函数用于解析一个字符串,并返回一个整数 substring() 方法用于提取字符串中介于两个指定下标之间的字符. stringObject.subst
var Stack = (function(){ var items = new WeakMap(); //先入后出,后入先出 class Stack{ constructor(){ items.set(this,[]); } push(ele){ //入栈 var ls = items.get(this); ls.push(ele); } pop(){ //出栈 var ls = items.get(this); return ls.pop(); } size(){ //获取栈的长度 var
Count Color Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 34950 Accepted: 10542 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here, we get a new problem.
Description Fractions in octal (base 8) notation can be expressed exactly in decimal notation. For example, 0.75 in octal is 0.953125 (7/8 + 5/64) in decimal. All octal numbers of n digits to the right of the octal point can be expressed in no more t