{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# C++的变量"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 1. 变量"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "① 变量的作用就是就是给一段指定的内存空间起名，方便操作这段内存。\n",
    "\n",
    "② 语法：数据类型 变量名 = 初始值；\n",
    "\n",
    "③ 变量存在的意义：方便我们管理内存空间。\n",
    "\n",
    "④ 每一段内存都有一个地址编号。\n",
    "\n",
    "⑤ C++规定在创建一个常量或变量时，必须要指出相应的数据类型，否则无法给变量分配内存。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#include <iostream>\n",
    "using namespace std;\n",
    "\n",
    "int main()\n",
    "{\n",
    "\n",
    "    //变量创建的语法：数据类型 变量名 = 变量初始值\n",
    "    int a = 10;  \n",
    "\n",
    "    cout << \"a = \" << a << endl;   // 输出语句 cout << \"提示语\" << 变量 << endl; \n",
    "\n",
    "    system(\"pause\");\n",
    "\n",
    "    return 0;\n",
    "\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "运行结果：  \n",
    " - a = 10\n",
    " - 请按任意键继续. . ."
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3.6.3",
   "language": "python",
   "name": "python3.6.3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.3"
  },
  "toc": {
   "base_numbering": 1,
   "nav_menu": {},
   "number_sections": false,
   "sideBar": true,
   "skip_h1_title": false,
   "title_cell": "Table of Contents",
   "title_sidebar": "Contents",
   "toc_cell": false,
   "toc_position": {},
   "toc_section_display": true,
   "toc_window_display": true
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}