多集 insert()在 C++ STL 中的函式
C++ STL 中的多集 insert() 函式將元素從一個位置插入多集容器到另一個位置,從一個多集到另一個多集。
使用的函式列表
- ms.size() = 返回多集的大小。
- ms.insert() = 用於向多集中插入元素。
示例程式碼
#include <iostream> #include <set> #include <string> #include <cstdlib> using namespace std; int main() { multiset<int> ms; multiset<int>::iterator it, it1; int c, i; while (1) { cout<<"1.Size of the Multiset"<<endl; cout<<"2.Insert Element into the Multiset"<<endl; cout<<"3.Display Multiset"<<endl; cout<<"4.Exit"<<endl; cout<<"Enter your Choice: "; cin>>c; switch(c) { case 1: cout<<"Size of the Multiset: "<<ms.size()<<endl; break; case 2: cout<<"Enter value to be inserted: "; cin>>i; if (ms.empty()) it1 = ms.insert(i); else it1 = ms.insert(it1, i); break; case 3: cout<<"Elements of the Multiset: "; for (it = ms.begin(); it != ms.end(); it++) cout<<*it<<" "; cout<<endl; break; case 4: exit(1); break; default: cout<<"Wrong Choice"<<endl; } } return 0; }
輸出
1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 1 Size of the Multiset: 0 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 2 Enter value to be inserted: 1 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 2 Enter value to be inserted: 2 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 2 Enter value to be inserted: 4 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 2 Enter value to be inserted: 6 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 2 Enter value to be inserted: 7 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 3 Elements of the Multiset: 1 2 4 6 7 1.Size of the Multiset 2.Insert Element into the Multiset 3.Display Multiset 4.Exit Enter your Choice: 4 exit status 1
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