c++ - 搜索行尾的段错误

Question

我正在编写代码来计算文件的行数和字符数。

#include <fstream>
#include <iostream>
#include <stdlib.h>    
using namespace std;


int main(int argc, char* argv[])
    {
    ifstream read(argv[1]);


    char line[256];
    int nLines=0, nChars=0, nTotalChars=0;
    read.getline(line, 256);

    while(read.good())                      /
        {
        nChars=0;

        int i=0;
        while(line[i]!='\n')
            {

            if ((int)line[i]>32) {nChars++;}
            i++;
            }

        nLines++;
        nTotalChars= nTotalChars + nChars;
        read.getline(line, 256);
        }
    cout << "The number of lines is "<< nLines << endl;
    cout << "The number of characters is "<< nTotalChars << endl;
    }

行 while(line[i]!='\n') 似乎是以下错误的原因

Segmentation fault (core dumped)

我不知道哪里出了问题。互联网告诉我，据我所知，我正在正确检查一行的结尾。

Answer 1

您的代码将找不到 '\n'，因为它已从输入序列中丢弃。来自 getline 的文档:

The delimiting character is the newline character [...]: when found in the input sequence, it is extracted from the input sequence, but discarded and not written to s.

您应该搜索 '\0':

    while(line[i])
        {
        if ((int)line[i]>32) {nChars++;}
        i++;
        }