C++ Formatting Output Issue

Question

I have tried setw() function from iomanip library, wonder how this one text line can't be aligned. Here's the code :

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;
int main() {
    ifstream productlist;
    productlist.open("product.txt");
    if (!productlist.is_open()) {
        cout << "File failed to open \n";
        return 0;
    }
    string name, squantity, sprice;
    int quantity, price;
    string line;

    cout << "Product Name\t"  <<  "Quantity\t" << "Price\t"  << "Value\n";
    while (getline(productlist, line)) {
        stringstream ss(line);
        getline(ss, name, '/');
        getline(ss, squantity, '/');
        quantity = stoi(squantity);
        getline(ss, sprice);
        price = stoi(sprice); 
        int value = quantity * price;
        cout << name << "\t\t"<< quantity << "\t\t" <<  price << "\t" << value << endl;
    }
    productlist.close();
}

and here's the text file that I used in the said code.

Apple/5/10
Water/1/40
Pencil/10/11
Orange/2/10
Lemon/1/12
Krunch/2/50
Coco/2/14
Burgers/2/25
Lemonades/2/21
Pizzas/2/250

and here is the output

Product Name    Quantity        Price   Value
Apple           5               10      50
Water           1               40      40
Pencil          10              11      110
Orange          2               10      20
Lemon           1               12      12
Krunch          2               50      100
Coco            2               14      28
Burgers         2               25      50
Lemonades               2               21      42
Pizzas          2               250     500

I can use the setw() function and it would end up still the same as the output that I shown here.

Answer 1

Instead of using tabs to space things out, use setw and related methods:

 cout << left << setw(20) << setfill(' ') << name << left << setw(20) << quantity << ...

See here for more examples.