How to convert multiple numbers in a string into ints - c++

Question

I am confused as to how to take multiple strings that have numbers in them and convert them into an int. I have multiple lines of strings that are stored in data into ints and then insert them into a 2 dimensional arrays called values. A similar question was posted earlier on StackOverflow; however it does not seem to be working for me. I printed out what each line in data is, each string in data is as follows.
75
95 64
17 42 82
18 35 87 10
However when I output the numbers from value by using two for loops in main, it outputs as this.
75
0
0
0
95
64
0
0
95
64
0
0
17
42
82
0
17
42
82
0
18
35
87
10
18
35
87
10
0
0
0
0
I found that there are 8 columns and 8 elements in the array values when I printed the sizeof(values) and sizeof(values[0]); however, it appears that the program terminated as the last print statement, where I print hello does not occur. I provided the code I'm using below. I would like to know why this is occurring
and how I can fix it? Thanks.
//const char DELIMITER = ' ';
int **values, // This is your 2D array of values, read from the file.
**sums; // This is your 2D array of partial sums, used in DP.
int num_rows; // num_rows tells you how many rows the 2D array has.
// The first row has 1 column, the second row has 2 columns, and
// so on...
bool load_values_from_file(const string &filename) {
ifstream input_file(filename.c_str());
if (!input_file) {
cerr << "Error: Cannot open file '" << filename << "'." << endl;
return false;
}
input_file.exceptions(ifstream::badbit);
string line;
vector<string> data;
try {
while (getline(input_file, line)) {
data.push_back(line);
num_rows ++;
}
input_file.close();
} catch (const ifstream::failure &f) {
cerr << "Error: An I/O error occurred reading '" << filename << "'.";
return false;
}
for(int x = 0; x < data.size(); x++){
cout << data[x] << endl;
}
//https://stackoverflow.com/questions/1321137/convert-string-containing-several-numbers-into-integers
//Help on making multiple numbers in a string into seperate ints
values = new int*[num_rows];
vector<int> v;
for(int y = 0; y < data.size(); y++){
istringstream stream(data[y]);
values[y] = new int[y + 1];
int z = 0;
while(1) {
int n;
stream >> n;
if(!stream)
break;
values[y][z] = n;
z++;
}
z = 0;
}
sums = values;
return true;
}
int main(int argc, char * const argv[]) {
if (argc != 2) {
cerr << "Usage: " << argv[0] << " <filename>" << endl;
return 1;
}
string filename(argv[1]);
if (!load_values_from_file(filename)) {
return 1;
}
cout << sizeof(values) << endl;
cout << sizeof(values[0]) << endl;
for(int x = 0; x < sizeof(values); x++){
for(int y = 0; y < sizeof(values[x]); y++){
cout << values[x][y] << endl;
}
cout << endl;
}
cout << "hello" << endl;
return 0;
}

Answer 1

See this :
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <algorithm>
using namespace std;
int main()
{
string str;
ifstream fs("D:\\Myfolder\\try.txt", ios::in);
stringstream ss;
std::string item;
if (fs.is_open())
{
ss << fs.rdbuf();
str = ss.str();
cout << str << endl;
fs.close();
}
cout << "\n\n Output \n\n";
while (std::getline(ss, item, ' '))
{
cout << std::atoi(item.c_str()) <<" ";
}
return 0;
}