C++ cout分离

Question

我想知道是否有办法设置 w(#) 以便我的 couts 对齐，如果我要更改我的措辞，它们将继续对齐。所以我想我要问的是打印出与指标分开的值，几乎就像在自己的列中一样？？

示例输出:(原创)

Enter the meal price for the first guest: $45.00
Enter the meal price for the second guest: $50.00
Enter the meal price for the third guest: $100.00

Tax:                             $13.16
Tip:                             $41.63
Total Bill:                      $249.79
Tip Per Person:                  $13.88
Total Per Person:                $83.26
The 3rd guest saved:             $16.74

(更改文本)

Enter the meal price for the first guest: $45.00
Enter the meal price for the second guest: $50.00
Enter the meal price for the third guest: $100.00

Tax:                             $13.16
Gratuity:                        $41.63
Total Bill:                      $249.79
Tip Per Person:                  $13.88
Total Per Person:                $83.26
The 3rd guest saved:             $16.74

(我的代码)

#include <iomanip> //std:setprecision
#include <iostream>

using namespace std;

int main() {

    double ppl1, ppl2, ppl3, meal_total, tax, tip, total, total_bill, per_tip, per_total;

    // Get the cost of the meal
    cout << "Enter the meal price for the first guest: $";
    cin >> ppl1;
    // Get the cost of the meal
    cout << "Enter the meal price for the second guest: $";
    cin >> ppl2;
    // Get the cost of the meal
    cout << "Enter the meal price for the third guest: $";
    cin >> ppl3;
    cout << endl;
    // Caluates the tax & tip & total
    meal_total = ppl1 + ppl2 + ppl3;
    tax = meal_total * 6.75 / 100;
    tip = (tax + meal_total) * 20 / 100;
    total_bill = (tax + meal_total) + tip;
    per_tip = tip / 3;
    per_total = total_bill / 3;

    // I do not have the extra credit in place
    cout << "\nTax:                 $" << setprecision(2) << fixed << tax;
    cout << "\nTip:                 $" << setprecision(2) << fixed << tip;
    cout << "\nTotal bill:          $" << setprecision(2) << fixed << total_bill;
    cout << "\nTip per person:      $" << setprecision(2) << fixed << per_tip;
    cout << "\nTotal per person:    $" << setprecision(2) << fixed << per_total << endl;

    // Additional Lab2A adding starts here:
    // Adding vars to calulate savings on an per User basis
    // then "If" the "Guest total" is greater then 0 we are displaying savings

    double ppl1_Tax = ppl1 * 6.75 / 100;
    ;
    double ppl1_Tip = (tax + ppl1) * 20 / 100;
    double Price_ppl1 = (ppl1 + ppl1_Tax) + ppl1_Tip;
    if ((Price_ppl1 - per_total) > 0) {
        cout << "The 1st guest saved: $" << (Price_ppl1 - per_total) << endl;
    }

    double ppl2_Tax = ppl2 * 6.75 / 100;
    ;
    double ppl2_Tip = (tax + ppl2) * 20 / 100;
    double Price_ppl2 = (ppl2 + ppl2_Tax) + ppl2_Tip;
    if ((Price_ppl2 - per_total) > 0) {
        cout << "The 2nd guest saved: $" << (Price_ppl2 - per_total) << endl;
    }

    double ppl3_Tax = ppl3 * 6.75 / 100;
    ;
    double ppl3_Tip = (tax + ppl3) * 20 / 100;
    double Price_ppl3 = (ppl3 + ppl3_Tax) + ppl3_Tip;
    if ((Price_ppl3 - per_total) > 0) {
        cout << "The 3rd guest saved: $" << (Price_ppl3 - per_total) << endl;
    }

    return 0;
}

Answer 1

您回答了自己的问题，只需使用 setw(width)，辅助函数示例:

void print_padded(const std::string& word, int width) {
    std::cout << std::left << std::setw(width) << std::setfill(' ') << word;
};

添加更多信息，如果您不知道是否会有大于 width 的 words，请跟踪最大的 word 并将 width 设置为 word.length() + 2 或类似的值。