本文主要是介绍C++ 抛出并捕获多个异常，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
// Project20161020.cpp : 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include<iostream>
#include<exception>
#include<fstream>
#include<string>
#include<vector>
using namespace std;
/**
抛出并捕获多个异常
*/
void readIntegerFile(const string& fileName, vector<int> &dest)
{ifstream istr;int temp;istr.open(fileName);if (istr.fail()){throw runtime_error("Unable to open the file");}while (istr >> temp){dest.push_back(temp);}if (!istr.eof()){//We did not reach the end-of-file//This means that some error occurred while reading the file//Throw an exception//文件结尾是非数字 则抛出throw runtime_error("Error reading the file.");}
}
int main()
{vector<int> myInts;const string& fileName = "C:/Users/Administrator/Desktop/IntegerFile.txt";try {readIntegerFile(fileName, myInts);}catch (const exception e) {cerr << e.what() << endl;return 1;}for (const auto element : myInts){cout << element << " ";}cout << endl;return 0;
}
#include "stdafx.h"
#include<iostream>
#include<stdexcept>
#include<fstream>
#include<string>
#include<vector>
using namespace std;
/**也可以让readIntegerFile()抛出两种不同类型的异常。以下是实现如果不能打开文件，则抛出invalid_argument类异常对象，如果无法读取整数，就抛出runtime_error类对象。invalid_argument和runtime_error都是定义在<stdexcept>头文件中的类
*/
void readIntegerFile(const string& fileName, vector<int> &dest)
{ifstream istr;int temp;istr.open(fileName);if (istr.fail()){throw invalid_argument("Unable to open the file");}while (istr >> temp){dest.push_back(temp);}if (!istr.eof()) {//We did not reach the end-of-file//This means that some error occurred while reading the file//Throw an exception//文件结尾是非数字 则抛出throw runtime_error("Error reading the file.");}
}
int main()
{vector<int> myInts;const string& fileName = "C:/Users/Administrator/Desktop/IntegerFile.txt";//main()函数可以用两个catch语句捕获invalid_argument和runtime_errortry {readIntegerFile(fileName, myInts);}catch (const invalid_argument& e) {cerr << e.what() << endl;return 1;}catch (const runtime_error& e) {cerr << e.what() << endl;return 1;}for (const auto&element : myInts) {cout << element << " ";}cout << endl;return 0;
}
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