Sometimes you need a vector or list of associations. An association is a pair of values that has some link in the problem model. For example, a student and grade are associated with each other.
Suppose you want to maintain the grade of each student. You need a list of all the students together with their grades. This can be done by using
Here’s the basic building block of a map:
vector > stu_gra;string stu;int gra;do{ cin >> stu >> gra; stu_gra.push_back(pair(stu,gra) );} while (stu != "end"); When you want to retrieve the values stored in the vector (or list) of pairs, you write:
vector > :: iterator i = stu_gra.begin();while(i != stu_gra.end()){ cout << "Student : " << i->first << ", Grade : " << i->second << endl; i++;} The first and second members are used to access the respective elements of pair.
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