Reading in characters and creating array c++

Question

How would one go about reading in a line of characters from a file. First the program reads in an integer from the file. That number indicates how many characters to read in in the next step.Next reads the characters in and store them in an array. So how do i create the 'char' variable so that i can correctly read in the characters from Michael to displaying them in an array.

file.txt: 
8 
Michael

im using inputFile >> integer, from there i need that integer to use to make this array char mike[integer];, then i can read in the chars to the array

It's more of a C problem. In C++ I would never use raw arrays for this. There are fancy containers and classes to hold string arrays. — sh03
– sh03, Commented Mar 21, 2013 at 0:55
Why not just put Michael in the file and read a std::string? Or are you actually only reading partial strings/lines? — Qaz
– Qaz, Commented Mar 21, 2013 at 0:57
i need to get the letters out of michael, so i can seperate later, therfore i need char — Mnramos92
– Mnramos92, Commented Mar 21, 2013 at 1:01

gongzhitaao · Accepted Answer · 2013-03-21 00:59:48Z

1

To answer your question:

#include <fstream>
using namespace std;

int main() {
    ifstream f("file.txt");
    int n;
    f >> n;
    char chs = new char[n];
    for (int i = 0; i < n; ++i) f >> chs[i];

    // do something about chs

    delete [] chs;
}

But, I would go with (if your Michael appears on its own line):

#include <fstream>
#include <string>
using namespace std;

int main() {
    ifstream f("file.txt");
    int n;
    f >> n;
    string str;
    getline(f, str);
}

edited Mar 21, 2013 at 0:59

answered Mar 21, 2013 at 0:54

gongzhitaao

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3 Comments

Mnramos92 Over a year ago

im using inputFile >> integer, from there i need that integer to use to make this array char mike[integer];, then i can read in the chars to the array

Thomas Matthews Over a year ago

Need to check "inputFile >> integer" for failure. The statement will fail if EOF is encountered or an integer was not found.

gongzhitaao Over a year ago

@ThomasMatthews Well I think I just need to provide a skeleton for read in strings. As for error checking, I think we need more assumptions about the input file format and OP can do that accordingly :)

user1990357 · Accepted Answer · 2013-03-21 15:13:56Z

0

#include <fstream.h>
#include <string.h>

int main() 


    {
        ifstream f("file.txt",ios::in);
        int n;
        f >> n;
        char string[n];
        f.getline(string,n);
       cout<<string;

    }

This gives output off the following string in file.txt.

answered Mar 21, 2013 at 15:13

user1990357

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