从文件读取时，如何跳过数组的第一行？ [英] How do I skip the first line of an array when reading from a file?

问题描述

我试图从文本文件中读取值，然后将它们粘贴到数组中。我使用的文本文件是这样的;

I'm trying to read values from a text file and then stick them into an array. The text file I'm using is like this;

Big Stone Gap,VA
Red-tailed_Hawk     1              
Mourning_Dove       66              
Red-bellied_Woodpecker  5              
Yellow-bellied_Sapsucker 1             
Downy_Woodpecker    4              
Pileated_Woodpecker     2              
Blue_Jay        8              
American_Crow       89             
Carolina_Chickadee      8              
Black-capped_Chickadee  6              
Tufted_Titmouse     12             
Red-breasted_Nuthatch   2              
White-breasted_Nuthatch  9             
Carolina_Wren       3              
American_Robin      1              
Northern_Mockingbird    1              
European_Starling   5              
Eastern_Towhee      3              
Field_Sparrow       13            
Fox_Sparrow         1              
Song_Sparrow        8              
White-throated_Sparrow  11            
Dark-eyed_Junco     9             
Northern_Cardinal   30            
Purple_Finch        7              
House_Finch         6             
American_Goldfinch      29

尝试将它们读入数组，然后输出数组。我必须做其他的东西，（改变从用户输入的值），但我知道如何做到这一点。我的问题是这个;当我运行它，它读取 Big 和 Stone ，并将它们放入值。这不是我想要的;它应该是 Red_Tailed_Hawk 和 1 。我有我的代码如下;我不知道该怎么做才能使它正常工作。请原谅一些变量;我使用int数组而不是字符串数组来处理这个脚本。

I'm trying to read them into an array, and then output the array. I have to do other stuff, (alter the values from user input), but I know how to do that. My problem is this; When I run it, it reads Big and Stone, and puts them into the values. This isn't what I want; It should be something like Red_Tailed_Hawk and 1. I have my code below; I have no idea what to do to get it to work right. Please excuse some of the variables; I cannibalized this script from another project I did with int arrays instead of string arrays.

#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

const int NUMBER_OF_STUDENTS = 28;
const int NUMBER_OF_SCORES = 28;

void getData (ifstream& infile, string matrix[][NUMBER_OF_SCORES + 1 ],
                    int NUMBER_OF_STUDENTS) ;

void printMatrix(string matrix[][NUMBER_OF_SCORES + 1], int NUMBER_OF_STUDENTS);



int main()
{
string birdarray [NUMBER_OF_STUDENTS][NUMBER_OF_SCORES +1 ] ;
              // column 0 will hold the student ID.
              // row n has the ID and birdarray for student n.


ifstream inData; //input file stream variable
inData.open("one.txt");

if ( !inData)
{
     cout << "invalid file name \n";

     return 1;
}

// input the birdarray into two-D array birdarray
getData ( inData , birdarray, NUMBER_OF_STUDENTS );
printMatrix(birdarray, NUMBER_OF_STUDENTS);



// return  the row number of a searchItem in a particular column.
// if not found, return -1
}


void getData (ifstream& infile,string chart[][NUMBER_OF_SCORES + 1 ],
                    int student_count)

{
 int row, col;


 for ( row = 0; row < student_count; row++)
    for (col =0; col <  NUMBER_OF_SCORES +1  ; col++)
        infile  >> chart [row] [col] ;


}
void printMatrix(string matrix[][NUMBER_OF_SCORES + 1], int NUMBER_OF_STUDENTS)
{
int row, col;
//this code below is to loop it so it displays all the values
// for (row = 0; row < NUMBER_OF_STUDENTS + 1; col++)
// {
//   cout << right << matrix[row][col];
 //  cout << endl;
//}

//this is just some test code to see if it can output certain values right
cout << matrix[0][2];
cout << matrix[0][3];
cout << matrix[0][4];
cout << matrix[0][5];
}

推荐答案

string line;     
getline(infile, line)
for ( row = 0; row < row_count; row++)
        for (col =0; col <  column_count +1  ; col++)
            getline(infile, line);
            chart[row][col] = line;

Streams的行为类似于它们的同名。你不能跳过流中的内容，例如跳过数组，你可以做的是忽略的东西，因为它漂浮。

Streams behave like their namesake. You can't skip what comes in the stream like jumping through an array, all you can do is ignore stuff as it floats by.

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