目录
构建数组
最简单的定义一个数组:
#include<iostream>
using namespace std;
int main()
{
int MyNumbers[5] = { 34, 56, -21, 5002, 365 };
for (int i = 0; i < 6; i++)
{
cout <<"Number: "<< MyNumbers[i] << endl;
}
return 0;
}
结果如下:
修改存储在数组中的数据
#include<iostream>
using namespace std;
int main()
{
const int index = 5;
int MyNumbers[index] = {100};
cout << "Old: " << MyNumbers[0] << endl;
int newIndex = 0;
MyNumbers[newIndex] = 20;
cout << "New: " << MyNumbers[0] << endl;
return 0;
}
我们可以设置一个数组,里面的空间为5,每个位置赋成100,然后,更新索引(索引为从0开始计数)为20,结果如下:
创建多维数组及访问
#include<iostream>
using namespace std;
int main()
{
int ThreeRowsThreeColumns[3][3] = \
{ {1, 2, 3}, { 4,5,6 }, { 7,8,9 }};
cout << "[0][1]: " << ThreeRowsThreeColumns[0][1] << endl;
return 0;
}
效果如下:
动态数组构建
#include<iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> DynArrNums(3);
DynArrNums[0] = 1;
DynArrNums[1] = 2;
DynArrNums[2] = 3;
cout << "NEW Number of integers in array: " << DynArrNums.size() << endl;
int AnotherNum = 232;
DynArrNums.push_back(AnotherNum);
cout << "OLD Number of integers in array: " << DynArrNums.size() << endl;
return 0;
}
结果如下: