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法律研究C++ 中的陣列類
C++ 中的陣列類足夠高效，並且知道其自身的大小。
用於對陣列執行操作的函式為
- size() = 返回陣列的大小，即返回陣列的元素數。
- max_size() = 返回陣列的最大元素數。
- get()、at()、運算子 [] = 訪問陣列元素。
- front() = 返回陣列的第一個元素。
- back() = 返回陣列的最後一個元素。
- empty() = 如果陣列大小為 true，則返回 true，否則返回 false。
- fill() = 用特定值填充整個陣列。
- swap() = 交換一個數組與另一個數組的元素。
這裡有一個示例來實現上述所有操作 −
示例程式碼
#include<iostream>
#include<array>
using namespace std;
int main() {
array<int,4>a = {10, 20, 30, 40};
array<int,4>a1 = {50, 60, 70, 90};
cout << "The size of array is : ";
//size of the array using size()
cout << a.size() << endl;
//maximum no of elements of the array
cout << "Maximum elements array can hold is : ";
cout << a.max_size() << endl;
// Printing array elements using at()
cout << "The array elements are (using at()) : ";
for ( int i=0; i<4; i++)
cout << a.at(i) << " ";
cout << endl;
// Printing array elements using get()
cout << "The array elements are (using get()) : ";
cout << get<0>(a) << " " << get<1>(a) << " "<<endl;
cout << "The array elements are (using operator[]) : ";
for ( int i=0; i<4; i++)
cout << a[i] << " ";
cout << endl;
// Printing first element of array
cout << "First element of array is : ";
cout << a.front() << endl;
// Printing last element of array
cout << "Last element of array is : ";
cout << a.back() << endl;
cout << "The second array elements before swapping are : ";
for (int i=0; i<4; i++)
cout << a1[i] << " ";
cout << endl;
// Swapping a1 values with a
a.swap(a1);
// Printing 1st and 2nd array after swapping
cout << "The first array elements after swapping are : ";
for (int i=0; i<4; i++)
cout << a[i] << " ";
cout << endl;
cout << "The second array elements after swapping are : ";
for (int i = 0; i<4; i++)
cout << a1[i] << " ";
cout << endl;
// Checking if it is empty
a1.empty()? cout << "Array is empty":
cout << "Array is not empty";
cout << endl;
// Filling array with 1
a.fill(1);
// Displaying array after filling
cout << "Array content after filling operation is : ";
for ( int i = 0; i<4; i++)
cout << a[i] << " ";
return 0;
}輸出
The size of array is : 4 Maximum elements array can hold is : 4 The array elements are (using at()) : 10 20 30 40 The array elements are (using get()) : 10 20 The array elements are (using operator[]) : 10 20 30 40 First element of array is : 10 Last element of array is : 40 The second array elements before swapping are : 50 60 70 90 The first array elements after swapping are : 50 60 70 90 The second array elements after swapping are : 10 20 30 40 Array is not empty Array content after filling operation is : 1 1 1 1
更新日期:30-Jul-2019
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