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法律學C++ 程式實現向量
向量是一個動態陣列，如果插入或刪除元素，它可以自動調整自身大小。向量元素包含在連續的儲存中，容器會自動處理儲存。
下面給出了實現向量的程式 -
範例
#include <iostream>
#include <vector>
#include <string>
#include <cstdlib>
using namespace std;
int main() {
int ch, val;
vector<int> vec;
cout<<"1)Insert Element into the Vector"<<endl;
cout<<"2)Delete Last Element of the Vector"<<endl;
cout<<"3)Print size of the Vector"<<endl;
cout<<"4)Display Vector elements"<<endl;
cout<<"5)Clear the Vector"<<endl;
cout<<"6)Exit"<<endl;
do {
cout<<"Enter your Choice: "<<endl;
cin>>ch;
switch(ch) {
case 1:
cout<<"Enter value to be inserted: "<<endl;
cin>>val;
vec.push_back(val);
break;
case 2:
cout<<"Last Element is deleted."<<endl;
vec.pop_back();
break;
case 3:
cout<<"Size of Vector: ";
cout<<vec.size()<<endl;
break;
case 4:
cout<<"Displaying Vector Elements: ";
for (int i = 0; i < vec.size(); i++)
cout<<vec[i]<<" ";
cout<<endl;
break;
case 5:
vec.clear();
cout<<"Vector Cleared"<<endl;
break;
case 6:
cout<<"Exit"<<endl;
break;
default:
cout<<"Error....Wrong Choice Entered"<<endl;
}
} while (ch!=6);
return 0;
}輸出
以上程式的輸出如下
1)Insert Element into the Vector 2)Delete Last Element of the Vector 3)Print size of the Vector 4)Display Vector elements 5)Clear the Vector 6)Exit Enter your Choice: 1 Enter value to be inserted: 5 Enter your Choice: 1 Enter value to be inserted: 2 Enter your Choice: 1 Enter value to be inserted: 8 Enter your Choice: 1 Enter value to be inserted: 6 Enter your Choice: 3 Size of Vector: 4 Enter your Choice: 4 Displaying Vector Elements: 5 2 8 6 Enter your Choice: 2 Last Element is deleted. Enter your Choice: 3 Size of Vector: 3 Enter your Choice: 4 Displaying Vector Elements: 5 2 8 Enter your Choice: 5 Vector Cleared Enter your Choice: 3 Size of Vector: 0 Enter your Choice: 4 Displaying Vector Elements: Enter your Choice: 9 Error....Wrong Choice Entered Enter your Choice: 6 Exit
在以上程式中，先是定義了向量，然後向用戶提供了一個選單，讓他們選擇向量操作。如下所示 −
vector<int> vec; cout<<"1)Insert Element into the Vector"<<endl; cout<<"2)Delete Last Element of the Vector"<<endl; cout<<"3)Print size of the Vector"<<endl; cout<<"4)Display Vector elements"<<endl; cout<<"5)Clear the Vector"<<endl; cout<<"6)Exit"<<endl;
使用 do while 迴圈輸入使用者選擇，使用 switch 語句根據選擇實現操作。不同的操作包括將元素插入向量、從向量刪除元素、列印向量的長度、顯示向量的元素、清除向量和退出。程式碼片段如下 −
do {
cout<<"Enter your Choice: "<<endl;
cin>>ch;
switch(ch) {
case 1:
cout<<"Enter value to be inserted: "<<endl;
cin>>val;
vec.push_back(val);
break;
case 2:
cout<<"Last Element is deleted."<<endl;
vec.pop_back();
break;
case 3:
cout<<"Size of Vector: ";
cout<<vec.size()<<endl;
break;
case 4:
cout<<"Displaying Vector Elements: ";
for (int i = 0; i < vec.size(); i++)
cout<<vec[i]<<" ";
cout<<endl;
break;
case 5:
vec.clear();
cout<<"Vector Cleared"<<endl;
break;
case 6:
cout<<"Exit"<<endl;
break;
default:
cout<<"Error....Wrong Choice Entered"<<endl;
}
} while (ch!=6);
更新於：25-6 月-2020
866 次瀏覽
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