filelines2.cpp

C++&datastructure书籍源码,以前外教提供现在与大家共享

#include <iostream>
#include <fstream>
#include <cstdlib>    // for exit
#include <string>
using namespace std;

#include "prompt.h"

// count # of lines and chars in input file

int main()
{
    long numChars = 0;
    long numLines = 0;
    char ch;
	string filename = PromptString("enter name of input file: ");
    ifstream input;
    input.open(filename.c_str());

    if (input.fail() )
    {   cout << "could not open file " << filename << endl;
        exit(1);
    } 
    while (input.get(ch))            // reading char succeeds?
    {   if ('\n' == ch)              // read newline character
        {   numLines++;          
        }
        numChars++;
    }
    
    cout << "number of lines = " << numLines
         << ", number of characters = " << numChars << endl;
    return 0;
}