{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# C++的调用其他类" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "# 1. 类中有其他的类" ] }, { "cell_type": "code", "execution_count": null, "metadata": {}, "outputs": [], "source": [ "#include \n", "using namespace std;\n", "\n", "//点和圆关系案例\n", "\n", "//点类\n", "class Point\n", "{\n", "public:\n", " //设置x\n", " void setX(int x)\n", " {\n", " m_X = x;\n", " }\n", " //获取x\n", " int getX()\n", " {\n", " return m_X;\n", " }\n", " //设置y\n", " void setY(int y)\n", " {\n", " m_Y = y;\n", " }\n", " //获取y\n", " int getY()\n", " {\n", " return m_Y;\n", " }\n", "\n", "private:\n", " int m_X;\n", " int m_Y;\n", "};\n", "\n", "//圆类\n", "class Circle\n", "{\n", "public:\n", " //设置半径\n", " void setR(int r)\n", " {\n", " m_R = r;\n", " }\n", " //获取半径\n", " int getR()\n", " {\n", " return m_R;\n", " }\n", " //设置圆心\n", " void setCenter(Point center)\n", " {\n", " m_Center = center;\n", " }\n", " //获取圆心\n", " Point getCenter()\n", " {\n", " return m_Center;\n", " }\n", "private:\n", " int m_R; //半径\n", " Point m_Center; //圆心 //在类中可以让另一个类 作为本类中的成员\n", "};\n", "\n", "//判断点和圆关系\n", "void isInCircle(Circle& c, Point& p)\n", "{\n", " //计算两点之间距离 平方\n", " int distance =\n", " (c.getCenter().getX() - p.getX()) * (c.getCenter().getX() - p.getX()) +\n", " (c.getCenter().getY() - p.getY()) * (c.getCenter().getY() - p.getY()); //c.getCenter()返回的是圆心点center类\n", " //可以调用圆心点center类中的方法\n", "\n", " //计算半径的平方\n", " int rDistance = c.getR() * c.getR();\n", "\n", " //判断关系\n", " if (distance == rDistance)\n", " {\n", " cout << \"点在圆上\" << endl;\n", " }\n", " else if (distance > rDistance)\n", " {\n", " cout << \"点在圆外\" << endl;\n", " }\n", " else\n", " {\n", " cout << \"点在圆内\" << endl;\n", " }\n", "}\n", "\n", "int main()\n", "{\n", " //创建圆\n", " Circle c;\n", " c.setR(10);\n", " Point center;\n", " center.setX(10); //设置点的横坐标\n", " center.setY(0); //设置点的纵坐标\n", " c.setCenter(center); //设置点类传入圆类\n", "\n", " //创建点\n", " Point p;\n", " p.setX(10);\n", " p.setY(10);\n", "\n", " //判断关系\n", " isInCircle(c, p);\n", "\n", " system(\"pause\");\n", "\n", " return 0;\n", "\n", "}" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "运行结果: \n", " - 点在圆上 \n", " - 请按任意键继续. . ." ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "# 2. 导入其他文件的类" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 2.1 point.h头文件" ] }, { "cell_type": "code", "execution_count": null, "metadata": {}, "outputs": [], "source": [ "//这是point.h头文件\n", "\n", "#pragma once //防止头文件重复包含，防止头文件冲突\n", "#include //标准输入输出\n", "using namespace std; //标准命名空间\n", "\n", "//只要函数声明、变量声明\n", "//成员函数只需要声明就好了，末尾有分号。\n", "class Point\n", "{\n", "public:\n", " //设置x\n", " void setX(int x);\n", "\n", " //获取x\n", " int getX();\n", "\n", " //设置y\n", " void setY(int y);\n", "\n", " //获取y\n", " int getY();\n", "\n", "\n", "private:\n", " int m_X;\n", " int m_Y;\n", "};" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 2.2 point.cpp源文件" ] }, { "cell_type": "code", "execution_count": null, "metadata": {}, "outputs": [], "source": [ "//这是point.cpp源文件\n", "#include \"point.h\"\n", "\n", "//定义函数时，要加上作用域，\"双冒号::\"表示Point作用域下的函数\n", "void Point::setX(int x)\n", "{\n", " m_X = x;\n", "}\n", "//获取x\n", "int Point::getX()\n", "{\n", " return m_X;\n", "}\n", "//设置y\n", "void Point::setY(int y)\n", "{\n", " m_Y = y;\n", "}\n", "//获取y\n", "int Point::getY()\n", "{\n", " return m_Y;\n", "}" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 2.3 circle.h头文件" ] }, { "cell_type": "code", "execution_count": null, "metadata": {}, "outputs": [], "source": [ "#pragma once \n", "#include //标准输出流\n", "using namespace std; //标准命名空间\n", "#include \"Point.h\" //一个类中用到另一个类，把另一个类包含的头文件包含进来\n", "\n", "//圆类\n", "class Circle\n", "{\n", "public:\n", " //设置半径\n", " void setR(int r);\n", "\n", " //获取半径\n", " int getR();\n", "\n", " //设置圆心\n", " void setCenter(Point center);\n", "\n", " //获取圆心\n", " Point getCenter();\n", "\n", "private:\n", " int m_R; //半径\n", " Point m_Center; //圆心 //在类中可以让另一个类 作为本类中的成员\n", "};" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 2.4 circle.cpp头文件" ] }, { "cell_type": "code", "execution_count": null, "metadata": {}, "outputs": [], "source": [ "//这是circle.cpp头文件\n", "\n", "#include \"circle.h\"\n", "\n", "//设置半径\n", "void Circle::setR(int r)\n", "{\n", " m_R = r;\n", "}\n", "\n", "//获取半径\n", "int Circle::getR()\n", "{\n", " return m_R;\n", "}\n", "\n", "//设置圆心\n", "void Circle::setCenter(Point center)\n", "{\n", " m_Center = center;\n", "}\n", "\n", "//获取圆心\n", "Point Circle::getCenter()\n", "{\n", " return m_Center;\n", "}" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## 2.5 main.cpp文件" ] }, { "cell_type": "code", "execution_count": null, "metadata": {}, "outputs": [], "source": [ "//这个是主文件 .cpp文件\n", "\n", "#include \n", "using namespace std;\n", "#include \"circle.h\" //想用点类，就要包含点类的头文件\n", "#include \"point.h\" //想用圆类，就要包含点类的头文件\n", "\n", "\n", "//判断点和圆关系\n", "void isInCircle(Circle& c, Point& p)\n", "{\n", " //计算两点之间距离 平方\n", " int distance =\n", " (c.getCenter().getX() - p.getX()) * (c.getCenter().getX() - p.getX()) +\n", " (c.getCenter().getY() - p.getY()) * (c.getCenter().getY() - p.getY()); //c.getCenter()返回的是圆心点center类\n", " //可以调用圆心点center类中的方法\n", "\n", " //计算半径的平方\n", " int rDistance = c.getR() * c.getR();\n", "\n", " //判断关系\n", " if (distance == rDistance)\n", " {\n", " cout << \"点在圆上\" << endl;\n", " }\n", " else if (distance > rDistance)\n", " {\n", " cout << \"点在圆外\" << endl;\n", " }\n", " else\n", " {\n", " cout << \"点在圆内\" << endl;\n", " }\n", "}\n", "\n", "int main()\n", "{\n", " //创建圆\n", " Circle c;\n", " c.setR(10);\n", " Point center;\n", " center.setX(10); //设置点的横坐标\n", " center.setY(0); //设置点的纵坐标\n", " c.setCenter(center); //设置点类传入圆类\n", "\n", " //创建点\n", " Point p;\n", " p.setX(10);\n", " p.setY(10);\n", " \n", " //判断关系\n", " isInCircle(c, p);\n", "\n", " system(\"pause\");\n", "\n", " return 0;\n", "\n", "}" ] } ], "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 }