Coud any one give me a hand?

[Dovydas Milius]

How to read file in array if you know the number of rows but you dont know the number of columns?
Thank you!

[giblit]

Read in the entire line then push them into a vector or some sort of dynamic array.


I don't know what data types you are reading in but I will assume they are integers. Though if not it is a very trivial task to change.

std::vector<std::vector<int> > data;

for(int row = 0; row < rows; ++row)
{
    std::vector<int> tempData;
    std::string str;
    std::getline(in, str);
    std::istringstream ss(str);
    int temp;
    while(ss >> temp)
        tempData.push_back(temp);

    data.push_back(tempData);
}

You could accomplish this with static/dynamic arrays too if you really wanted to but would be a little bit more complicated.

[Dovydas Milius]

Yes I'm reading integer type of files. If you going to write with comments its gonna be much better for me. And could you show me other way with dynamic arrays? Thank you!

[giblit]

Just count the spaces in the entire line (str contains 1 line). This can be used to determine the number of "items" you must read in to the array. Also so you can create it dynamically. You could alternatively read in the line twice, the first time counting and the second time adding to the array. There may be a better solution but I can't really think of one.

[Dovydas Milius]

I've got:
1000 4 // 1000 means money, 4 means rows
and there is the prices in the shelfs:
3 15 360 8
5 2 1 145 99 300
4 700 600 900 800
2 8 1
And here I'm stick, coz I don't know how to read columns without exact number of columns

[Dovydas Milius]

Its not working...

[giblit]

Well what exactly have you tried? How do we know what isn't working?

[Dovydas Milius]

#include <fstream>
#include <iomanip>
#include <iostream>
#include <cmath>
#include <string>


using namespace std;

const char CDfv[] = "Duom.txt";
const char CRfv[] = "Result.txt";
const int CMax = 500;
//------------------------------------------------------------------------------

void skaityti (int & p, int & n, char kaina[CMax]);
void spausdinti (int p, int n, int kaina[CMax]);

//------------------------------------------------------------------------------
using namespace std;

int main()
{

int p;
int n;
char kaina[CMax];

skaityti (p, n, kaina);

return 0;
}

void skaityti (int & p, int & n, char kaina[CMax])
{

ifstream fd(CDfv);

string line;
int a = 0;
int b = 0;

while (getline(fd,line))
{

cout << line << endl;

}



}
How I need to find out how many integers there is in every row?

[giblit]

Like I said earlier you could either read in each row twice first time counting second time doing something with it or you could count the number of spaces. Kind of how you would count the number of words in a sentence.