filelines.cpp

来自「C++&datastructure书籍源码,以前外教提供现在与大家共享」· C++ 代码 · 共 32 行

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;
#include "prompt.h"

// count # of lines in input file

int main()
{
    ifstream input;
    string s;                              // line entered by user    
    long  numLines = 0;    
    long  numChars = 0;
	string filename = PromptString("enter name of input file: ");
    input.open(filename.c_str());

    if (input.fail() )
    {   cout << "could not open file " << filename << endl;
        exit(1);
    }
    
    while (getline(input,s))
    {   numLines++;
        numChars += s.length();
    }
    cout << "number of lines = " << numLines
         << ", number of characters = " << numChars << endl;
    return 0;
}