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string
1、常用操作
//11152245
#include <iostream>
#include <string>
using namespace std;
int main(){
string s1; //初始化字符串，空字符串
string s2=s1; //s2为s1的副本
string s3="i am yasuo"; //直接初始化并赋值
string s4(10,'a'); //s4存的字符串是aaaaaaaaaa
string s5(s4); //s5为s4的副本
string s6("i am ali");
string s7=string(6,'c');
cout<<"s6.size="<<s7.size() <<endl;
cout<<(s2.empty() ?"this is a empty string":"this is not a empty string")<<endl;
}
/*
output:
s6.size=6
this is a empty string
--------------------------------
Process exited after 0.785 seconds with return value 0
请按任意键继续. . .
*/2、迭代器iterator在string的应用
//11152303
#include <iostream>
#include <string>
using namespace std;
int main(){
string str("hello world");
//使用iterator遍历字符串
for(string::const_iterator it=str.begin() ;it!=str.end() ;it++){
cout<<*it<<endl;
}
}
/*
output:
h
e
l
l
o
w
o
r
l
d
--------------------------------
Process exited after 0.6435 seconds with return value 0
请按任意键继续. . .
*/3、string的查找子串等功能
//11152310
#include <iostream>
#include <string>
using namespace std;
int main(){
string str("hello world");
cout<<str.find("ll",0)<<endl;
if(str.find("aa",0)==string::npos )
cout<<"找不到该子串"<<endl;
}
/*
2
找不到该子串
--------------------------------
Process exited after 0.6054 seconds with return value 0
请按任意键继续. . .
*/vector
1、vector常用操作
//11152310
#include <iostream>
#include <vector>
using namespace std;
int main(){
vector<int> v1;
//存入vector
for(int i=0;i<10;i++) v1.push_back(i);
//输出vector，但是注意要知道vector的长度，此方法不太好
for(int i=0;i<10;i++) cout<<v1[i];
cout<<endl;
//顺序输出通法。使用iterator迭代器输出 ，默认顺序输出
for(vector<int>::iterator it=v1.begin() ;it!=v1.end() ;it++ )
cout<<*it;
cout<<endl;
//反向输出通法。使用reverse_iterator迭代器逆序输出
for(vector<int>::reverse_iterator it=v1.rbegin() ;it!=v1.rend() ;it++ )
cout<<*it;
}
/*
0123456789
0123456789
9876543210
--------------------------------
Process exited after 0.4554 seconds with return value 0
请按任意键继续. . .
*/2、
#include <iostream>
#include <vector>
#include <string>
using namespace std;
template <typename T>
void showvector(vector<T> v)
{
for (vector<T>::iterator it = v.begin(); it != v.end(); it++)
{
cout << *it;
}
cout << endl;
}
int main()
{
vector<string> v6 = { "hi","my","name","is","lee" };
v6.resize(3); //重新调整vector容量大小
showvector(v6);
vector<int> v5 = { 1,2,3,4,5 }; //列表初始化,注意使用的是花括号
cout << v5.front() << endl; //访问第一个元素
cout << v5.back() << endl; //访问最后一个元素
showvector(v5);
v5.pop_back(); //删除最后一个元素
showvector(v5);
v5.push_back(6); //加入一个元素并把它放在最后
showvector(v5);
v5.insert(v5.begin()+1,9); //在第二个位置插入新元素
showvector(v5);
v5.erase(v5.begin() + 3); //删除第四个元素
showvector(v5);
v5.insert(v5.begin() + 1, 7,8); //连续插入7个8
showvector(v5);
v5.clear(); //清除所有内容
showvector(v5);
system("pause");
return 0;
} map
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