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法学容器在 C++ 中如何工作？
矢量具有在插入或删除元素时可自动调整自身大小的功能，而且容器会自动处理它们的存储。矢量元素存储在连续存储空间中，以便可以使用迭代器进行访问和遍历。数据可以插入或删除这些矢量的开头、中间或结尾。
这是一个 C++ 程序，展示了矢量的多种功能。
算法
Begin Declare a variable v of vector type. Declare another variable it as iterator of vector type. Declare another two variable c and i to the ineger datatype. while (1) do print “1.Size of the Vector”. print “2.Insert Element into the Vector”. print “3.Delete Last Element of the Vector”. print “4.Resize the vector”. print “5.Reserve the vector”. print “6.Display the capacity of vector”. print “7.Display by Iterator”. print “8.Clear the Vector”. print “9.Exit”. print “Enter your Choice:”. Enter the value of variable c. Switch(c) Case 1. Print “Size of Vector:”. Call size() function to print the size of the vector. Break. Case 2. Print “Enter value to be inserted:”. Enter the value of variable i. Call push_back() function to input the values in the vector. Break. Case 3. Print “Delete Last Element Inserted:”. Call pop_back() function to delete the values in the vector. Break. Case 4. Print “Resize the vector elements:”. Call resize() function to resize the vector. Break. Case 5. Print “Reserve the vector elements:”. Call reserve() function to reserve the size of the vector. Break. Case 6. Print “Displaying capacity of vector:”. Call capacity() function to display the capacity of the vector. Break. Case 7. Print “Displaying Vector by Iterator:”. for (it = v.begin(); it != v.end(); it++) print the value of iterator it. Break. Case 8. Call clear() function to clear the vector. Print “Vector Cleared”. break case 9. call exit() function to take exit. break. Default. Print “Wrong choice”. End.
示例代码
#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> v;
vector<int>::iterator it;
int c, i;
while (1) {
cout<<"1.Size of the Vector"<<endl;
cout<<"2.Insert Element into the Vector"<<endl;
cout<<"3.Delete Last Element of the Vector"<<endl;
cout<<"4.Resize the vector"<<endl;
cout<<"5.Reserve vector"<<endl;
cout<<"6.Display the capacity of vector"<<endl;
cout<<"7.Display by Iterator"<<endl;
cout<<"8.Clear the Vector"<<endl;
cout<<"9.Exit"<<endl;
cout<<"Enter your Choice: ";
cin>>c;
switch(c) {
case 1:
cout<<"Size of Vector: ";
cout<<v.size()<<endl;
break;
case 2:
cout<<"Enter value to be inserted: ";
cin>>i;
v.push_back(i);
break;
case 3:
cout<<"Delete Last Element Inserted:"<<endl;
v.pop_back();
break;
case 4:
cout<<"Resize the vector elements:"<<endl;
v.resize(10);
break;
case 5:
cout<<"Reserve the vector elements:"<<endl;
v.reserve(100);
break;
case 6:
cout<<"Displaying capacity of vector: ";
cout<<v.capacity()<<endl;
break;
case 7:
cout<<"Displaying Vector by Iterator: ";
for (it = v.begin(); it != v.end(); it++) {
cout<<*it<<" ";
}
cout<<endl;
break;
case 8:
v.clear();
cout<<"Vector Cleared"<<endl;
break;
case 9:
exit(1);
break;
default:
cout<<"Wrong Choice"<<endl;
}
}
return 0;
}输出
1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 1 Size of Vector: 0 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 1 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 3 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 2 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 4 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 5 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 6 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 7 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 8 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 9 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 10 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 11 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 2 Enter value to be inserted: 12 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 1 Size of Vector: 12 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 7 Displaying Vector by Iterator: 1 3 2 4 5 6 7 8 9 10 11 12 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 4 Resize the vector elements: 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 7 Displaying Vector by Iterator: 1 3 2 4 5 6 7 8 9 10 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 3 Delete Last Element Inserted: 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 7 Displaying Vector by Iterator: 1 3 2 4 5 6 7 8 9 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 8 Vector Cleared 1.Size of the Vector 2.Insert Element into the Vector 3.Delete Last Element of the Vector 4.Resize the vector 5.Reserve vector 6.Display the capacity of vector 7.Display by Iterator 8.Clear the Vector 9.Exit Enter your Choice: 9
更新于: 30-7-2019
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