2017.06.04 c++文件学习

// a8.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <iostream>#include <fstream>#include <cstdlib>using namespace std;const int SIZE=60;int _tmain(int argc, _TCHAR* argv[]){char filename[SIZE];ifstream infile;cout<<"Enter name of data file:";cin.getline(filename,SIZE);infile.open(filename);if(!infile.is_open()){cout<<"Cound not open the file :"<<filename<<endl;cout<<"Program terminating .\n"<<endl;exit(EXIT_FAILURE);}double value;double sum=0.0;int count=0;infile>>value;while(infile.good()){++count;sum+=value;infile>>value;}if(infile.eof()){cout<<"End of file reached;\n";}else if(infile.fail()){cout<<"Input terminated by data mismatch.\n";}else{cout<<"Input terminated for unknown reason.\n";}if(count==0)cout<<"No data processed.\n";else{cout<<"Item read:"<<count<<endl;cout<<"Sum:"<<sum<<endl;cout<<"Average:"<<double(sum/count)<<endl;}infile.close();return 0;}