reading file

[kassik]

Hi
I'm doing a little c++ project. I have a notepad file and I would like to read each line into a separate array of integers.Suppose I have a text file that looks like this:

001-1   *  1/4
002-2   * 1/32
010-1   * -1/1
011-2   * -3/8
01-21   * 1/4
01-10   * 1/2
020-2   * -1/8
02-20   * 1/16
02-1-1   * -3/8
100-1   * 1/1
101-2   * 1/2
10-21   * -1/1
110-2   * 1/4
11-1-1   * 1/2
12-2-1   * 1/3
12-1-2   * 1/6
1-22-1   * -1/1
1-2-12   * 1/2
1-11-1   * -1/1
1-12-2   * -3/8
1-1-22   * 1/8
200-2   * 1/8
21-1-2   * 1/12
22-2-2   * 1/16
2-22-2   * -1/8
2-11-2   * 1/4

I want to read every integer in a row and put it separately in another file in order to be readable by an array.
I would like to make an array that for instance for first line of this example the contents of array are:
x[0]=0 ,x[1]=0 , x[2]=1, x[3]=-1, x[4]=1, x[5]=4
in order to put into the array, I need to separate these integers.I want to know how to separate these numbers.

any help is appreciated.

[hamsterman]

Write a function read_dighit which reads a char, if that char is a digit (falls between '0' and '9'), return it -'0'. If it is a '-', read the next char and return -(it-'0').
Then use cin >> to read the number before /, cin.ignore() to skip the / and cin>> again to read the number after /. Then use cin>>ws (I think..) or cin.ignore() to skip the end of line.

[kassik]

my codes looks like as follows:

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

int main ()
{
int i;
string str;
string str2=" ";
// used in the same order as described above:
ifstream one ("one.dat");
ofstream two ("two.dat");
if (one.is_open())
{
while(one.good()) {
getline(one,str);


if (str!="-")
{
int i=str.find("-");
str.insert(i,str2);
}
else

two<<str<<endl;
}
}
else
cout<<"unable to open the file";
one.close();
two.close();


//cout << str << endl;
return 0;
}

[hamsterman]

getline will read the whole line. use cin.get() to read a single character and cin>> to read a number.

[kassik]

Thanks for your attention
it really worked but I have still problem.
my code is :

#include<iostream>
#include<string>
#include<fstream>

using namespace std;
int main()  {
    char c;
    

    ifstream one("one.dat");
    ofstream two("two.dat");
    while (one.good())
    {

        c=one.get();
       
        if(c!='-')
        two<<c<<" ";
        else

       two <<c;
    }
    one.close();
    two.close();
    return 0;
}

which my output looks like this:

 0 0 1 -1           1 / 4 
 0 0 2 -2           1 / 3 2 
 0 1 0 -1           -1 / 1 
 0 1 1 -2           -3 / 8 
 0 1 -2 1           1 / 4 
 0 1 -1 0           1 / 2 
 0 2 0 -2           -1 / 8 
 0 2 -2 0           1 / 1 6 
 0 2 -1 -1           -3 / 8 
 1 0 0 -1           1 / 1 
 1 0 1 -2           1 / 2 
 1 0 -2 1           -1 / 1 
 1 1 0 -2           1 / 4 
 1 1 -1 -1           1 / 2 
 1 2 -2 -1           1 / 3 
 1 2 -1 -2           1 / 6 
 1 -2 2 -1           -1 / 1 
 1 -2 -1 2           1 / 2 
 1 -1 1 -1           -1 / 1 
 1 -1 2 -2           -3 / 8 
 1 -1 -2 2           1 / 8 
 2 0 0 -2           1 / 8 
 2 1 -1 -2           1 / 1 2 
 2 2 -2 -2           1 / 1 6 
 2 -2 2 -2           -1 / 8 
 2 -1 1 -2           1 / 4 
 ÿ 

which for instance in second line it returns

...   / 3 2 

which I want it to be 32
in order to solve I attempted to write a code like this:

#include<iostream>
#include<string>
#include<fstream>

using namespace std;
int main()  {
    char c;

    ifstream one("one.dat");
    ofstream two("two.dat");
    while (one.good())
    {

        c=one.get();
        #include<iostream>
#include<string>
#include<fstream>

using namespace std;
int main()  {
    char c;

    ifstream one("one.dat");
    ofstream two("two.dat");
    while (one.good())
    {

        c=one.get();
  if(c=='*')          //separate right part by star when it reach to star put the same data to the "two" file and do nothing for this part till it reaches to next line.
        {
            two<<c;

            one.ignore(20,'\n'); //I don't know how to use ignore function or even does it work for this purpose.     
        }
        if(c!='-')
        two<<c<<" ";
        else

       two <<c;
    }
    one.close();
    two.close();
    return 0;
}


        if(c!='-')
        two<<c<<" ";
        else

       two <<c;
    }
    one.close();
    two.close();
    return 0;
}

[Computergeek01]

That's becaue cin.get(...) delimits itself at one character, what you want is cin.getline(...) and tell it to delimit itself at the whitespace.

[kassik]

Thanks.
it worked
I'm happy.