Pair是一个简单的容器,由两个数据对象组成:
‘first’ = The first element is referenced as ‘first’ ‘second’ = the second element and the order is fixed (first, second).
可以分配,比较和复制对。它用于将两个类型可能不同的值组合在一起。
语法为:pair <数据类型1,数据类型2>变量名称(数据值1,数据值2)。
Begin Write pair<data type1,data type 2>variable name(datavalue1,datavalue2) Print the pairs End
#include<iostream> using namespace std; int main() { pair <char,int> value('a',7); pair <string,double> fruit ("grapes",2.30); pair <string,double> food ("pulao",200); cout<<"The value of "<<value.first<<" is "<<value.second <<endl; cout<<"The price of "<<fruit.first<<" is Rs. "<<fruit.second <<endl; cout<<"The price of "<<food.first<<" is Rs. "<<food.second <<endl; return 0; }
输出结果
The value of a is 7 The price of grapes is Rs. 2.3 The price of pulao is Rs. 200