C++ Primer 第10章 pair类型

//10.2.cpp//至少使用三种方法创建pair对象。//编写三个版本的程序，分别采用不同的方法来创建pair对象//方法1：在定义pair对象时提供初始化式来创建pair对象#include<iostream>#include<vector>#include<utility>#include<string>using namespace std;int main(){pair<string,int> sipr;string str;int ival;vector<pair<string,int>> pvec;cout<<"Enter a string and a integer(Ctrl-z to end):"<<endl;while(cin>>str>>ival){sipr=pair<string,int>(str,ival);pvec.push_back(sipr);}return 0;}//方法2：直接访问pair对象来创建pair对象#include<iostream>#include<vector>#include<utility>#include<string>using namespace std;int main(){pair<string,int> sipr;string str;int ival;vector<pair<string,int>> pvec;cout<<"Enter a string and a integer(Ctrl-z to end):"<<endl;while(cin>>str>>ival){sipr.first=str;sipr.second=ival;pvec.push_back(sipr);}return 0;}//方法3：用make_pair函数来生成pair对象#include<iostream>#include<vector>#include<utility>#include<string>using namespace std;int main(){pair<string,int> sipr;string str;int ival;vector<pair<string,int>> pvec;cout<<"Enter a string and a integer(Ctrl-z to end):"<<endl;while(cin>>str>>ival){sipr=make_pair(str,ival);pvec.push_back(sipr);}return 0;}