STL—vector、string

vector 向量容器

C++代码功能实现

#include<vector>
#include<stdlib.h>
#include<iostream>
#include<algorithm>
using namespace std;
bool  Comp(const int &a,const int &b)
{
  if(a!=b)  return a>b;
  else  return a>b;
}
int main()
{
  vector<int> v(10);
  for(int i=0;i<10;i++)
    v[i]=i;
  v.erase(v.begin()+2);//删除 
  vector<int>::iterator t;
  for(t=v.begin();t!=v.end();t++)
    cout<<*t<<" "; 
  cout<<endl;
  v.erase(v.begin()+4);
  for(t=v.begin();t!=v.end();t++)
    cout<<*t<<" "; 
  cout<<endl;
  v.erase(v.begin()+1,v.begin()+5);
  for(t=v.begin();t!=v.end();t++)
    cout<<*t<<" ";
  cout<<endl<<v.size()<<endl;
//  v.clear();
  cout<<v.size()<<endl<<v[0]<<" "<<v[1]<<" "<<v[2]<<" "<<v[3]<<endl;
  reverse(v.begin(),v.end());
  for(t=v.begin();t!=v.end();t++)
    cout<<*t<<" ";
  cout<<endl;
  vector<int> a;
  for(int i=0;i<10;i++)
    a.push_back(9-i);
  for(int i=0;i<10;i++)
    cout<<a[i]<<" ";
  cout<<endl;
  sort(a.begin(),a.end());//按升序排序 
  for(int i=0;i<10;i++)
    cout<<a[i]<<" ";
  vector<int> b;
  for(int i=0;i<10;i++)
    b.push_back(i);
  cout<<endl;
  sort(b.begin() ,b.end(),Comp);//按Comp规则排序 
  for(int i=0;i<10;i++)
    cout<<b[i]<<" ";
  cout<<endl;
  cout<<b.size()<<endl;//包含多少个元素 
  cout<<b.empty()<<endl;//如果为0则为真，为1则为假； 
  b.clear();//清空 
  cout<<b.empty()<<endl;
  cout<<endl; 
  return 0;
}

string 容器

C++代码实现

#include<string.h>
#include<iostream>//向量需要
#include<algorithm>//使用反向排序reverse()函数 
#include<vector>
using namespace std;
int main()
{
  string s;//创建字符串对象
  s="zhang wei play C++.";//对象赋值 
  cout<<s.length()<<endl;
  cout<<s<<endl; //下标从零开始计数 
  char ss[1000];
  scanf("%s",ss);
  s=ss;//把字符数组赋值给string对象 
  cout<<s<<endl;
  s=s+'z';//string对象尾部加字符 
  s=s+'w';
  cout<<s<<endl;
  s=s+"zhangwei";//尾部加字符串
  cout<<s<<endl;
  s.append("iewgnahz");//与尾部加字符串一样 
  cout<<s<<endl; 
  string::iterator t;//定义迭代器
  t=s.begin();
  s.insert(t+5,'&');//插入第5个字符前 
  s.insert(t+14,'&');//插入第14个字符前 
  cout<<s<<endl;
  cout<<s[0]<<endl;
  cout<<s[0]-'1'<<endl;//两个相同的字符相减为零
  t=s.begin();
  s.erase(t+1);//删除1位置字符 
  cout<<s<<endl;
  s.erase(t+1);
  cout<<s<<endl;
  s.erase(t+1,t+13);        //删除1~13区间元素 
  cout<<s<<endl;
  string s1;
  s1=s;
  cout<<s.length()<<endl;
  s1="";      //清空字符串 
  cout<<s1.empty()<<endl;
  s=s+"abcd";
  s.replace(2,3,"555");//从第2个开始将连续的三个字符替换555 
  cout<<s<<endl; 
  cout<<s.find("555")<<endl;
  cout<<s.find('a')<<endl;
  cout<<s.find("good")<<endl;
  cout<<s.find('o')<<endl;
  cout<<s.compare("1234")<<endl;//比较，s大返回1；小返回-1；相同返回0；
  reverse(s.begin(),s.end());//反向排序 
  cout<<s<<endl; 
  vector<string> v;//类似于字符串数组 
  v.push_back("jack");
  v.push_back("Tom");
  cout<<v[0]<<endl;
  cout<<v[1]<<endl;
  cout<<v[0][3]<<endl;
  cout<<v[1][2]<<endl;
  s="12345";
  cout<<s<<endl;
  int sum=0;
  for(int i=0;i<s.length();i++)
  {
    sum+=s[i]-'0';
  }
  cout<<sum<<endl;
  cin>>s;
  reverse(s.begin(),s.end());
  cout<<s<<endl;
  printf(s.c_str());
  cout<<endl;
  return 0;
}