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本文目录一览:

  • 1、js为完全对称偏差,故其上下偏差相等为什么是错的
  • 2、js方法求2-200之间素数的代码
  • 3、一个对称数为95859两小时出现新的对称数问该车速为多少javascript
  • 4、JavaScript 问题答案!!
  • 5、JavaScript 杨辉三角
  • 6、js代码解密求救

js为完全对称偏差,故其上下偏差相等为什么是错的

因为基本偏差表有规定,IT7~IT11时,若IT查出来的数值为奇数的话,应该用IT-1除以2

js方法求2-200之间素数的代码

以下代码可以实现JavaScript求n个素数,当n=500时满足题目需求。

function prime(n){

    var primeArr = [2];

    var isPrime = function(num, primeList){

        if(num == 2){

            return true;

        }

        for(var i = 3, iLen = Math.sqrt(num), j = 1; i = iLen; i = primeList[j++]){

            if(num % i == 0){

                return false;

            }

        }

        return true;

    }

    if(isNaN(n) || n  1){

        return [];

    }

    for(var i = 3,  i  n; i += 2){

        if(isPrime(i, primeArr)){

            primeArr.push(i);

 

        }

    }

    return primeArr;

}

prime(200)

 

//函数调用

prime(200);//计算200以内的素数:

素数即除去1和其本身两个数之外,不能被任何数整除的整数。

由公理可知,如果一个整数能被分解成多个整数,则必有一个数不大于该整数的平方根(反证法可知,如果分解成的两个数都大于平方根,则乘积必大于原数),故在循环时,只需循环到该数的平方根即(Math.sqrt(num)为求平方根)

如果一个数能被2整除,则除2之外其他数都不是素数,故从3开始遍历能够减少循环次数

如果一个数能够被分解,则最终分解结果必然为多个素数之积,故循环时只需要尝试之前算好的素数能否整除当前的数,极大减少循环次数

一个对称数为95859两小时出现新的对称数问该车速为多少javascript

思路:

1、从95859开始递增,逐个判断是否为对称数,得到95859后的一个对称数。

2、得到两数的差并除以2,得到汽车的速度。

一下是实现代码:

static void Main(string[] args)

{

long Mileage_Start = 95859;//上午10点里程表的公里数

long Mileage_Over = Mileage_Start;//刚开始两数相同

do{

Mileage_Over++;

}

while (!isPalindrome(Mileage_Over));//调用isPalindrome()方法判断是否为对称数,是则跳出循环。

Console.WriteLine(“下一个对称数为:{0}”, Mileage_Over);

Console.WriteLine(“2个小时行驶了:{0}KM”, Mileage_Over – Mileage_Start);

Console.WriteLine(“汽车的速度为:{0}KM/小时”, (Mileage_Over – Mileage_Start)/2);

}

public static bool isPalindrome(long _Mileage) {

string Mileage = _Mileage.ToString();

Stack stack = new Stack();

bool flag = true;

char[] Mile = Mileage.ToCharArray();

for (int i = 0; i Mile.Length;i++ )

{

stack.Push(Mile[i].ToString());//压栈

}

ArrayList array = new ArrayList();

for(int i =0;iMile.Length;i++){

array.Add(stack.Pop());//出栈

if (array[i].ToString() != Mile[i].ToString())//头尾相应的位置比较,不同则不为对称数,返回False.

{

flag = false;

break;

}

}

return flag;

}

*******************************运行结果************************************

下一个对称数为:95959

2个小时行驶了:100KM

汽车的速度为:50KM/小时

JavaScript 问题答案!!

1.var m=new Array(10);

for(i=0;im.length;i++)

{

m[i]=Math.floor(Math.random()*100+1);

}

var n=new Array(9);

for(j=0;jn.length;j++)

{

n[j]=Math.floor(Math.random()*100+1);

}

var arr=new Array();

arr=arr.concat(m,n);

document.write(“将九个整数放到包含10个元素的一维数组中:”+arr+”br”);

for(k=0;karr.length;k++)

{

for(s=0;sarr.length-k;s++)

{

if(arr[s]arr[s+1])

{

r=arr[s];

arr[s]=arr[s+1];

arr[s+1]=r;

}

}

}

document.write(“排序:”+arr+”br”);

var f=new Array(1);

f=parseInt(prompt(“请输入一个数:”));

document.write(“添加的数:”+f+”br”);

var t=new Array();

t=t.concat(arr,f);

for(k=0;kt.length;k++)

{

for(s=0;st.length-k;s++)

{

if(t[s]t[s+1])

{

r=t[s];

t[s]=t[s+1];

t[s+1]=r;

}

}

}

document.write(“最后的排序”+t);

2.var n=parseInt(prompt(“请输入n的值。n=100”));

var k=new Array();

for(m=0;m=n;m++)

{

k[m]=Math.floor(Math.random()*1000+1);

}

document.write(k+”br”);

m=k.sort();

n=m.reverse();

document.write(“连成的最大整数为”+n.join(“”));

3. var str=prompt(“请输入一串英文:”);

var m=”a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z”;

m=m.split(“,”);

for(i=0;im.length;i++)

{

if(str.indexOf(m[i])==-1);

{

document.write(m[i]+”br”);

}

}

4. var m=prompt(“输入一个整数:”);

document.write(m+”br”);

k=prompt(“请输入k的值:”);

document.write(“第”+k+”位上的数是:”+m.charAt(k-1)+”br”);

5.for(a=100;a100000;a++)

{

a=a.toString();

len=a.length;

if(len==3)

{

if(a.charAt(0)==a.charAt(a.length-1)a%Math.sqrt(a)==0)

{

document.write(a+”br”);

}

}

else if(len==4)

{

continue;

}

else

{

if(a.charAt(0)==a.charAt(a.length-1)a.charAt(1)==a.charAt(a.length-2)a%Math.sqrt(a)==0)

{

document.write(a+”br”);

}

}

}

JavaScript 杨辉三角

代码如下:

function print(v){

if (typeof v == “number”) {

  var w = 30;

  if(n30) w = (n-30) + 40;

 var s = ‘span style=”padding:4px 2px;display:inline-block;text-align:center;width:’ + w + ‘px;”‘+v+’/span’;

 document.write(s);

}else{

  document.write(v);

}

}

var n = prompt(“请输入幂数:”,9);

n = n – 0;

var t1 = new Date();

var a1 = [1,1];

var a2 = [1,1];

print(‘div style=text-align:center;”‘);

for (var i = 0;i =n;i++![在这里插入图片描述]()){

  for (var j = 1; j i + 2; j++) {

    print(c(i,j));

}

print(“br /”);

}

print(“/div”);

var t2 = new Date();

print(“p style=’text-align:center;’耗时为(毫秒):”+(t2-t1)+”/p”);

function c(x,y){

  if ((y == 1) || (y == x + 1)) return 1;

  return c(x-1,y-1) + c(x-1,y);

}

扩展资料

杨辉三角的特点:

1、每个数等于它上方两数之和。

2、每行数字左右对称,由1开始逐渐变大。

3、第n行的数字有n项。

4、前n行共[(1+n)n]/2 个数。

5、第n行的m个数可表示为 C(n-1,m-1),即为从n-1个不同元素中取m-1个元素的组合数。

6、第n行的第m个数和第n-m+1个数相等 ,为组合数性质之一。

7、每个数字等于上一行的左右两个数字之和。可用此性质写出整个杨辉三角。即第n+1行的第i个数等于第n行的第i-1个数和第i个数之和,这也是组合数的性质之一。

js代码解密求救

把后面段贴上来,我帮你解.

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