ex1704.cpp

teach yourself C++ in 21 days 第五版

// Ex1704.cpp
#include <fstream>
#include <iostream>
using namespace std;
   
int main(int argc, char**argv)   // returns 1 on error
{
     if (argc != 2)
     {
        cout << "Usage: argv[0] <infile>\n";
        return(1);
     }
   
     // open the input stream
     ifstream fin (argv[1],ios::binary);
     if (!fin)
     {
        cout << "Unable to open " << argv[1] <<" for reading.\n";
        return(1);
     }
   
     char ch;
     while ( fin.get(ch))
        if ((ch > 32 && ch < 127) || ch == '\n'|| ch == '\t')
           cout << ch;
     fin.close();
}