Trying to read the file and tokenize each string to produce a bar chart

[techielove]

I have this .txt file. I want to extract each element that is separated by a space. For example, in line one I want to be able to extract "41" "63" as separate tokens to make a bar chart using *. The asterisk would represent the difference between the low to high temperature.

41 63
46 67
53 75
59 81
67 87
74 94
76 98
76 100
72 93
61 83
50 72
44 64

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

int main(){
    string line;
    ifstream temp_file;
    int months=-1;
    
    
    temp_file.open("temperature.txt");
    
    while(getline(temp_file,line)){
        months+=1;
        cout<<months<<right<<setw(30)<<line<<"\n"<<endl;
    }
    
temp_file.close();
}

This is what I have. it reads the file line by line, and have all the months too, but i don't know how to extract each token to make a bar chart.

[Handy Andy]

Hello techielove,

Try this:

#include <iostream>  // <--- You forgot this 1.
#include <iomanip>
#include <string>

#include <fstream>

using namespace std;

int main()
{
    string line;
    ifstream temp_file;
    int months{};
    int lowTemp{},highTemp{};  // <--- Added.


    temp_file.open("temperature.txt");
    // <--- How do you know it is open and ready to use?

    if (!temp_file)  // <---  Added.
    {
        std::cerr << "\n     File \"temperature.txt\" did not open\n";

        return 1;
    }

    while (temp_file >> lowTemp >> highTemp)  // <--- Changed.
    //while (getline(temp_file, line))
    {
        //months++;  // <--- Changed.

        //cout << months << right << setw(30) << line << "\n" << endl;

        cout << setw(2) << months++ << setw(4) << lowTemp << " " << setw(4) << highTemp << " Difference is: " << highTemp - lowTemp << "\n";
    }

    //temp_file.close();  // <--- Not required as the dtor will close the file when the function looses scope.

    return 0;  // <--- Not required, but makes a good break point for testing.
}

This produces this output:

 0  41   63 Difference is: 22
 1  46   67 Difference is: 21
 2  53   75 Difference is: 22
 3  59   81 Difference is: 22
 4  67   87 Difference is: 20
 5  74   94 Difference is: 20
 6  76   98 Difference is: 22
 7  76  100 Difference is: 24
 8  72   93 Difference is: 21
 9  61   83 Difference is: 22
10  50   72 Difference is: 22
11  44   64 Difference is: 20

This should give you some ideas of where to go from hers.

Andy

Edit:

[seeplus]

Do you mean like this:

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

int main() {
	std::ifstream temp_file("temperature.txt");

	if (!temp_file)
		return (std::cout << "Cannot open file\n"), 1;

	unsigned month {1};

	for (unsigned low {}, high {}; temp_file >> low >> high; ++month)
		std::cout << std::setw(2) << month << ": " << std::string(high - low, '*') << '\n';
}

 1: **********************
 2: *********************
 3: **********************
 4: **********************
 5: ********************
 6: ********************
 7: **********************
 8: ************************
 9: *********************
10: **********************
11: **********************
12: ********************