京东2019校招网络工程师笔试题

union X{
    int x
    char y[4] 
}

#include <iostream>
using namespace std
class D{
    int d
public: 
    D(int x=1):d(x){}
    ~D(){cout<<"D"}
} 
int main(){ 
    D d[]={_____________}
    D* p=new D[2]
    delete[]p
    return 0 
}

#include <iostream>
using namespace std
_______________________
void One(float one)
{ 
    cout<<"1"<<endl    
}
void Two(float two)
{ 
    cout<<"2"<<endl 
}
void Three(float three)
{ 
    cout<<"3"<<endl 
}
int main() 
{  
    float i=1,j=2,k=3
   function = One
   function(i)
   function= Two
   function(j)
   function = Three
   function(k)
}

#include<iostream> 
using namespace std
class complex 
{ public:
int real
int imag
complex(int r=0,int i=0) 
{ real=r
imag=i}
_________________________________
}
complex add(complex &a,complex & b) 
{int r=a.real+b.real
int i=a.imag+b.imag
return complex(r,i)}  
int  main( ) 
{complex x(1,2),y(3,4),z
z=add(x,y)
cout<<z.real<<"+"<<z.imag<<"i"<<endl}  

#include<iostream> 
#include<fstream> 
#include<string> 
using namespace std 
int main() 
{ofstream File1("text.txt")  
string d("20160314") 
string y=d.substr(0,4) 
int k=d.find("2")
int i=d.find("3") 
string m=d.substr(k+2,i-k) 
string dd=d.substr(i+1,2) 
string n=dd+m+y 
File1<<n<<endl 
File1.close() 
}                                            

#include <iostream>
using namespace std
template <class T>
void S(T &x, T &y)
{
    T temp
    temp = x
    x = y
    y = temp
}
template <class T>
void SS(T A[], int n)
{
    int min
    int i, j
    for (i=0 i<n-1 i++)
    {
        min=i
        for (j=_____ j<n j++)
            if (A[j]<A[min])
                min=j
        S(A[i], A[min])
    }
}

#include <iostream>
using namespace std
class shape 
{public:  
        virtual int area()=0
}  
class rectangle:public shape 
{public: 
        int a, b  
        void setLength (int x, int y) {a=xb=y} 
        int area() {return a*b} 
}

int main()   
{
    char c, s[20]
    strcpy(s, "Hello,World")
    printf("s[]=%6.9s\n", s)
    return 0
}

struct Student{
    int num
    char name[7]   
    short age
    char sex
}student1
int sz = sizeof(student1)

int main() {
 vector<int> vInt(1)
 cout << vInt[1]
 cout << vInt.at(1)
 return 0
}

int main() {
 vector<int> vInt
 for (int i=0 i<5 ++i)
 {
  vInt.push_back(i)
  cout << vInt.capacity() << " "
 }
 vector<int> vTmp(vInt)
 cout << vTmp.capacity() << "\n"
 return 0
}

int main() {
 int a(1), b(3), c(2)
 
 while (a < b < c)
 {
  ++a
  --b
  --c
 }
 cout << a << " " << b << " " << c << "\n"
 return 0

import re
m = re.search('[0-9]','a1b2c3d4')
print(m.group(0))

import datetime
t1 = datetime.datetime(2017,10,10,21,40)
t2 = datetime.datetime(2017,10,8,23,40)
tt1 = datetime.timedelta(seconds = 1200)
tt2 = datetime.timedelta(weeks = 3)
print(t1 - t2)

<?php
 $i='111'
printf("%d\n",printf("%d",printf("%d",printf("%d",$i))))
?>

<?php
url="http://www.hdw.com?uname=aaa&upass=123"
 $u_msg=substr($url,(strpos($url,'?')+1))
 parse_str($u_msg)
 echo "uname=".$uname."  upass={$upass}"
?>

<?php
 $bd="sina."
 echo "www.$bdcom"
?>

<?php
 $arr=array("1"=>"2","3"=>"4")
 while(list($k,$v)=each($arr)){
  echo $k.$v
 }
?>

<?php  
 function hideStar($str) { 
    if (strpos($str, '@')) {
    $email_array = explode("@", $str)
    $prevfix = (strlen($email_array[0]) < 4) ? "" : substr($str, 0, 3)     $count = 0
    $str = preg_replace('/([\d\w+_-]{0,100})@/', '***@', $str, -1, $count)
    $rs = $prevfix . $str
    } else {
    $pattern = '/(1[3458]{1}[0-9])[0-9]{4}([0-9]{4})/i'
    if (preg_match($pattern, $str)) {
    $rs = preg_replace($pattern, '$1****$2', $str) 
    } else {
    $rs = substr($str, 0, 3) . "***" . substr($str, -1)
    }
    }
    return $rs
 }
 echo hideStar("513309965@qq.com")
?>

<?php
 header("Content-type: text/html charset=utf8")
 $str="PHP工程师"
 echo strlen($str)."  ".mb_strlen($str)."  ".mb_strlen($str,'utf8')
?>

class a
    {
        protected $c
        public function a()
        {
            $this->c = 10
        }
    }
    class b extends a
    {
        public function print_data()
        {
            return $this->c
        }
    }
    $b = new b()
    echo $b->print_data()

class Computer{
     const NAME='dell' 
 }

#!/bin/bash
aa='Hello World !'