一維、二維動態數組的定義與其數值的輸入（使用數組與vector）

一、一維數組

1.動態數組來實現

#include<iostream>
#include<vector>
using namespace std;

int main() {
	//輸入行數
	int n;          
	cin >> n;

	//一維動態數組的申請
	int *a = new int[n];  

	//輸入數組的每個元素
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}

	for (int i = 0; i < n; i++) {
			cout << a[i]<< " ";
	}
    //申請的記得釋放
	delete[]a;
	system("pause");
	return 0;
}

2.vector來實現

#include<iostream>
#include<vector>
using namespace std;
int main() {
	//輸入行數
	int n;          
	cin >> n;
	vector<int> a(n);

	//輸入數組的每個元素
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}

	for (int i = 0; i < n; i++) {
			cout << a[i]<< " ";
	}
	system("pause");
	return 0;
}

二、二維數組

1.動態數組來實現

#include<iostream>
#include<vector>
using namespace std;

int main() {
	//輸入二維數組的行數和列數
	int n, m;
	cin >> n >> m;
	//定義一個n行m列的二維數組
	int **a = new int*[n];
	for (int i = 0; i < n; i++) {
		a[i] = new int[m];
	}
	//輸入每個元素
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> a[i][j];
		}
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cout << a[i][j] << " ";
		}
		cout << endl;
	}
    //二維數組的釋放
	for (int i = 0; i < n; i++)
		delete[]a[i];
	delete[]a;

	system("pause");
	return 0;
}

 

2.vector來實現

#include<iostream>
#include<vector>
using namespace std;

int main(){
	//輸入二維數組的行數和列數
	int n, m;
	cin >> n >> m;
	//定義一個n行m列的二維數組
	vector<vector<int>> a(n, vector<int>(m));
	//輸入每個元素
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> a[i][j];
		}
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cout << a[i][j] << " ";
		}
		cout << endl;
	}
	system("pause");
	return 0;
}