[C++知识库]26 C++ 二维数组练习

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

void array_2d() {
	//创建2行3列
	int arr1[2][3] = {
		{1,2,3},
		{4,5,6}
	};
	// 外层式行数  内层式列数
	for (int i = 0; i < 2; i++)
	{
		for (int j = 0; j < 3; j++)
		{
			cout<<arr1[i][j]<<",";
		}
		cout << endl;
	}

	cout << endl;
	cout<< "二维数组所占内存空间：" << sizeof(arr1) << endl;
	cout<< "二维数组一行所占内存空间：" << sizeof(arr1[0])<<endl;
	cout<< "每个二维数组元素所占内存空间：" << sizeof(arr1[0][0])<<endl;
	cout<< "二维数组元素个数：" << sizeof(arr1)/sizeof(arr1[0][0])<<endl;
	cout<< "二维数组的行数：" << sizeof(arr1)/sizeof(arr1[0])<<endl;
	cout<< "二维数组的列数：" << sizeof(arr1[0])/sizeof(arr1[0][0])<<endl;

	cout<< "二维数组首地址：" << (int)arr1<<endl;
	cout<< "二维数组第一行地址：" << (int)arr1[0]<<endl;
	cout<< "二维数组第二行地址：" << (int)arr1[1]<<endl;
	cout<< "二维数组第一行第一个元素地址：" << (int)&arr1[0][0]<<endl;//具体元素地址要加&
	cout<< "二维数组第一行第二个元素地址：" << (int)&arr1[0][1]<<endl;//具体元素地址要加&
	cout<< "二维数组第二行第一个元素地址：" << (int)&arr1[1][0]<<endl;//具体元素地址要加&

	// 数组应用
	int scores[3][3] = {
		{100,100,100},
		{90,50,100},
		{60,70,80}
	};

	string name[3] = {"张三","李四","王五"};

	for (int i = 0; i < 3; i++)
	{
		int sum = 0;
		for (int j = 0; j < 3; j++)
		{
			sum += scores[i][j];
		}
		cout << name[i]<<"的总成绩为：" << sum << endl;

	}




}