C++ Vector common basic operations
- 2020-05-30 20:55:10
- OfStack
The standard library vector type is the type 1 template which is mostly used in C++, and vector type is equivalent to a kind of dynamic container. In vector, there are mainly 1 basic operations, which are introduced in this paper. The specific contents are as follows:
(1) header #include < vector > .
(2) create vector object, vector < int > vec;
(3) insert a number at the end: vec.push_back (a);
(4) use subscripts to access elements, cout < < vec[0] < < endl; Remember the index starts at 0.
(5) use iterators to access elements.
vector<int>::iterator it;
for(it=vec.begin();it!=vec.end();it++)
cout<<*it<<endl;
(6) insert element: vec.insert (vec.begin ()+i,a); Insert a before the i+1 element;
(7) delete element: vec.erase (vec.begin ()+2); Delete the third element
vec.erase(vec.begin()+i,vec.end()+j); Delete interval [i,j-1]; Range from 0 start
(8) vector size: vec.size ();
(9) to empty: vec clear ();
Here's a simple example:
#include<iostream>
#include<stdio.h>
#include<vector>// Indefinite array, vector
#include<string>
using namespace std;
int main()
{
vector<string> v;
string temp;
cout<<" Please enter the 1 And press enter Ctrl+Z Represents the end of the cycle: "<<endl;
while(getline(cin,temp))//Ctrl+Z End of cycle
{
v.push_back(temp);
}
vector<string>::iterator t; // define 1 An iterator t
t=v.begin();
for(t;t!=v.end();t++)
{
(*t)[0]=toupper((*t)[0]);// To start the first 1 Capital letters
cout<<*t<<endl;
}
return 0;
}
/* Main functions: input 1 String, and then output 1 And capitalize the first letter
Input example:
ginger,you are the best!
^Z
Output:
Ginger,you are the best!
*/
conclusion