C++中的assign函数⽤法
assign()函数主要是将⼀个容器中元素全部复制到另⼀个容器中，⽽⼜有两种⽤法：
assign函数:
函数原型：
void assign(const_iterator first,const_iterator last);
梦到鞋子void assign(size_type n,const T& x = T());
功能：
将区间[first,last)的元素赋值到当前的vector容器中，或者赋n个值为x的元素到vector容器中，这个容器会清除掉vector容器中以前的内容。
实例：
#include <vector>
#include <iostream>
刘组词int main( )
{
using namespace std;
vector<int> v1, v2, v3;
vector<int>::iterator iter;
v1.push_back(10);
v1.push_back(20);
v1.push_back(30);
v1.push_back(40);
v1.push_back(50);
v2.push_back(1);
v2.push_back(2);
cout << "v1 = " ;
for (iter = v1.begin(); iter != v1.end(); iter++)
cout << *iter << " ";
cout << endl;
cout << "v2 = ";
for (iter = v2.begin(); iter != v2.end(); iter++)
cout << *iter << " ";
cout << endl;
怎么夸女孩子v2 = v1;
cout << "v2 = ";fault
for (iter = v2.begin(); iter != v2.end(); iter++)
cout << *iter << " ";
cout << endl;
v2.assign(v1.begin(), v1.end());情商培训
cout << "v2 = ";
for (iter = v2.begin(); iter != v2.end(); iter++)
cout << *iter << " ";
别丢掉cout << endl;
v3.assign(7, 3) ;
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cout << "v3 = ";
for (iter = v3.begin(); iter != v3.end(); iter++) cout << *iter << " ";
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cout << endl;
return 0;
}
