【C++ Primer Plus习题】15.2
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问题:
解答:
main.cpp
#include <iostream>
#include <cmath>
#include "exc_mean.h"
using namespace std;double hmean(double a, double b);
double gmean(double a, double b);int main()
{double x, y, z,m;cout << "请输入两个数字: ";while (cin >> x >> y){try{z = hmean(x, y);m = gmean(x, y);cout << x << "和" << y << "的调和平均数为" << z << endl;cout << x << "和" << y << "的几何平均数为" << m << endl;cout << "输入下一组数据,按q结束:" << endl;}catch (bad_hmean&bg){cout<<bg.what();cout << "Try again\n";continue;}catch (bad_gmean& hg){cout << hg.what();//cout << "Values used: " << hg.v1 << "," << hg.v2 << endl;cout << "Sorry, you don't get to play any more.\n";break;}}cout << "Bye" << endl;return 0;
}double hmean(double a, double b)
{if (a == -b)throw bad_hmean();return 2.0 * a * b / (a + b);
}
double gmean(double a, double b)
{if (a < 0 || b < 0)throw bad_gmean();return sqrt(a * b);
}
exc_mean.h
#pragma once
#include <iostream>
#include <stdexcept>
using namespace std;class bad_hmean:public logic_error
{
private:/*double v1;double v2;*/
public:bad_hmean(const string what_arg = "HMean,Invalid argument ") :logic_error(what_arg){}//void mesg();
};//inline void bad_hmean::mesg()
//{
// cout << "hmean(" << v1 << ", " << v2 << "):" << "invalid arguments: a= -b\n";
//}class bad_gmean:public logic_error
{
public://double v1;//double v2;bad_gmean(const string what_arg="GMean,Invalid argument") :logic_error(what_arg){}//const char* mesg();
};//inline const char* bad_gmean::mesg()
//{
// return "gmean() arguments should be >= 0\n";
//}运行结果:
考查点:
- 异常
注意:
- 异常标准头文件
- 初始化错误信息
- 抛出异常对象
- 接受异常
2024年9月11日20:08:42