recite and tip output alignment C++, output formatting

问题

I'm writing this code for my programming class and I got everything else to work however my output formatting isn't working out for me.

#include <iostream>
#include <iomanip>
#include <ios>

    using namespace std;

    int main()
    {
        double tip_fifteen;
        double tip_twenty;
        double tax;
        double bill;
        char dollars = '$';
        float meal_cost;

        cout << "Enter the meal cost: ";
        cin >> meal_cost;
        tip_twenty = meal_cost * .20;
        tip_fifteen = meal_cost * .15;
        tax = meal_cost * 0.0975;
        cout << "******************************************" << endl;

        //beginning outputs
        int digits;
        digits = meal_cost * 100 / 100;
        cout << setw(10) << left << "Meal Cost " << dollars;
        cout << setw(to_string(digits).length() + 3) << fixed << showpoint << setprecision(2) << meal_cost << endl;

        cout << setw(10) << left << "Tax " << dollars;
        cout << setw(to_string(digits).length() + 3) << fixed << showpoint << setprecision(2) << tax << endl;

        cout << setw(10) << left << "Tip (15%) " << dollars;
        cout << setw(to_string(digits).length() + 3) << fixed << showpoint << setprecision(2) << tip_fifteen << endl;

        //tip outputs then final output statements
        cout << setw(10) << left << fixed << setprecision(2) << "Tip (20%) " << dollars << tip_twenty << endl;
        bill = tip_fifteen + meal_cost + tax;
        cout << "Your total bill is " << fixed << setprecision(2) << dollars << bill << " after 15% gratuity." << endl << "or" << endl;
        bill = tip_twenty + meal_cost + tax;
        cout << "Your total bill is " << fixed << setprecision(2) << dollars << bill << " after 20% gratuity." << endl;



return 0;

I want my output to look like this

Enter the meal cost: 56
******************************************
Meal Cost $ 56.00
Tax       $  5.46
Tip (15%) $  8.40
Tip (20%) $ 11.20
Your total bill is 69.86 after 15% gratuity.
or
Your total bill is 72.66 after 20% gratuity.

my output looks like this

Enter the meal cost: 56
******************************************
Meal Cost $56.00
Tax       $5.46 
Tip (15%) $8.40 
Tip (20%) $11.20
Your total bill is $69.86 after 15% gratuity.
or
Your total bill is $72.66 after 20% gratuity.

I'm having a problem using setw with floats however it's not working when i try to set the same variable as an int. I've also tried using setw(25) to see if that would work somehow unfortunately it has not

回答1:

You need to use right if you want them aligned to the right, you also need to add a space " " after the dollars

cout << setw(10) << left << "Meal Cost " << dollars << " ";
cout << setw(to_string(digits).length() + 3) << fixed << right << showpoint << setprecision(2) << meal_cost << endl;

To this to all of the printed statements and you will get:

******************************************
Meal Cost $ 56.00
Tax       $  5.46
Tip (15%) $  8.40
Tip (20%) $ 11.20

回答2:

For there to be padding in the price column, setw has to be set to a large enough width.

For example:

std::cout << "$" << std::setw(10) << std::fixed
          << std::setprecision(2) << 56.0f << std::endl;

Prints:

$     56.00

Your code sets the width to:

std::to_string(digits).length() + 3

Which is only 5 characters, just enough to fit "56.00". For additional padding on the left you should increase the setw width.

来源：https://stackoverflow.com/questions/54776464/recite-and-tip-output-alignment-c-output-formatting

标签

c++

output

output-formatting