//7 – 1 One – dimensional Array
#include <iostream>
using namespace std;
int main() {
//1.the definition of array
//数据类型 数组名[数字 / 常量表达式];
int a[1024] = {1,2,3,45};
double b[520];
char c[1314];
//double a[1024]; //this is an error, we should not define two times the same name’s array
//All the elements have the same date type in an array
//the array’s lower number(下标) is start from 0 (a[0] a[1] a[2])
/*
int n = 1000;
int d[n];//error
//there must be a constant value in the array’s lower symbol
*/
int x1[10], x2[20], x3, x4, x5,x6[100]; // the array can be listed in a single line
//2.the access to the elements
//数组名 [下标]
//array’s name [index]
a[0], a[1023];
for (int i = 0; i < 4; ++i)
{
cout << a[i] << endl;
//only access the initialized values
}
//3.Reverse output
//please type in the n(n<100), and n numerical numbers, please reverse output these n numerical numbers
//输入一个n(n<100),和n个数，请逆序输出这n个数
int n;
int x[100];
cin >> n;
for (int i = 0; i < n; ++i) {
cin >> x[i];
}
for (int i = n – 1; i >= 0; –i) {
cout << x[i] << ‘ ‘;
}
cout << endl;
return 0;
}
//7 – 2 Two – dimensional Array
#include <iostream>
using namespace std;
//one dimensional array is a sequential list
//two dimensional array is like an excel table, which has rows and columns
int main() {
//two dimensional array can be related to matrices in linear algebra
//1.the definition of two dimensional arrays
//data type array name [rows] [columns] ;
//数据类型 数组名 [行] [列]
int arr[3][4];
for (int i = 0; i < 3; ++i) {
for (int j = 0; j < 3; ++j) {
arr[i][j] = i * j;
}
}
int b[4][4]{
{1,2},
{2,3},
{6,7,8},
{9,1}
};
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
cout << b[i][j] << ‘ ‘;
}
cout << endl;
}
cout << b << ‘ ‘; //the array name represents the starting address
return 0;
}