版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/qq78442761/article/details/84176459
目录
1.面向对象程序设计要点
面向对象程序设计要注意什么:
注意3点:
1.可维护性;
2.可扩展性;
3.可复用性;
4.灵活性好;
注意:要尽可能的避免重复;
要求业务逻辑与界面分离,让他们的耦合性降低。只有这样才能达到容易维护和扩展;
1.通过封装、继承、多态把程序的耦合度降低;
2.面向对象要结合设计模式使用,从而使得程序更加灵活,容易修改,并易于复用;
2.单使用封装性的例子
单使用封装性的面向对象程序设计:
运行截图如下:
源码如下:
Operation.h
#include <iostream>
#include <string>
#include <cmath>
using namespace std;
class Operation{
public:
static double getResult(double numberA, double numberB, string operate){
double result = 0.0;
enum operation
{
addOper,
subOper,
mulOper,
divOper
};
if(operate.compare("+") == 0){
result = numberA + numberB;
}
else if(operate.compare("-") == 0){
result = numberA - numberB;
}
else if(operate.compare("*") == 0){
result = numberA * numberB;
}
else if(operate.compare("/") == 0){
if(abs(numberB) < 0.0001)
throw "Division by zero condition!";
result = numberA / numberB;
}
else{
throw "The operator is wrong!";
}
return result;
}
};
main.cpp
#include "Operation.h"
int main(){
try{
double numberA, numberB;
string opera;
cout << "请输入数字A:";
cin >> numberA;
cout << "输入运算符(+、-、*、/):";
cin >> opera;
cout << "请输入数字B:";
cin >> numberB;
double result = Operation::getResult(numberA, numberB, opera);
cout << result << endl;
}
catch(const char *msg){
cout << "error informaiton:" << msg <<endl;
}
system("pause");
return 0;
}