三种定义数组的方式:分别是C语言的定义方式、STL vector和C++11的array对象。
附源代码:
数组的定义数组是由n(n≥1)个具有相同类型的数据元素a0,a1,a2,…,an-1组成的有序序列,且该序列必须存储在一块地址连续的存储单元中,并用一个统一的数组名标识。数据格式(data format)是描述数据保存在文件或记。
include <vector> // STL C++98#include <array> // C++11int main(){ using namespace std;// C,original C++ double a1[4] = {1.2,2.4,3.6,4.8};// C++98 STL vector<double> a2(4); // create vector with 4 elements// no simple way to initialize in C98 a2[0] = 1.0/3.0; a2[1] = 1.0/5.0; a2[2] = 1.0/7.0; a2[3] = 1.0/9.0;// C++11 -- create and initialize array object array<double,4> a3 = {3.14,2.72,1.62,1.41};array<double,4> a4; a4 = a3; // valid for array objects of same size// use array notation cout << "a1[2]: " << a1[2] << " at " << &a1[2] << endl; cout << "a2[2]: " << a2[2] << " at " << &a2[2] << endl; cout << "a3[2]: " << a3[2] << " at " << &a3[2] << endl; cout << "a4[2]: " << a4[2] << " at " << &a4[2] << endl;// misdeed a1[-2] = 20.2; cout << "a1[-2]: " << a1[-2] <<" at " << &a1[-2] << endl; cout << "a3[2]: " << a3[2] << " at " << &a3[2] << endl; cout << "a4[2]: " << a4[2] << " at " << &a4[2] << endl; cin.get(); return 0;}
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数组的4种定义方式:1.先声明再初始化 例如://1.声明 int[] nums;//初始化 nums = new int[5];2.声明并初始化 例如://2.声明、初始化 int[] nums = new int[10];3.创建数组同时赋值 例如://3.创建数。