似乎無法準確排列十進制數字

Question

我有一個簡單的程序，要求輸入電影的名稱以及爲set1和set2出售的門票數量。然後用這些值進行一些計算並顯示結果。我唯一的問題是，我似乎無法按照我希望的方式排列小數值。

控制檯中的最後三行輸出應該始終如此（帶有美元符號和小數點排列）：image。但是，當我爲門票的set1輸入1，並且爲門票的set2輸入0時，反之亦然，它看起來像這樣：image。關於如何使輸出始終與第一個屏幕截圖一致？提前致謝。

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

    using namespace std; 

    int main() { 

    string film = ""; 

    int set1 = 0; 
    int set2 = 0; 
    // the cinema always takes this 20% cut. 
    const double CINEMA_FEE = 0.20; 
    double profit = 0; 
    double profitMinusFee = 0; 
    double paidToMovieMaker = 0; 

    cout << "What is the name of the film: "; 
    getline(cin, film); 

    cout << "How many tickets for set1 sold: "; 
    cin >> set1; 

    cout << "How many tickets for set2 sold: "; 
    cin >> set2; 

    cout << "Film Name:" << setw(20) << "\"" << film << "\"" << endl; 
    cout << "Set1 tickets sold:" << setw(16) << set1 << endl; 
    cout << "Set2 tickets sold:" << setw(16) << set2 << endl; 

    set1 *= 10; 
    set2 *= 6; 
    profit = set1 + set2; 
    profitMinusFee = profit * CINEMA_FEE; 
    paidToMovieMaker = profit - profitMinusFee; 
    // needs to always show two decimal points and fixed 
    cout << setprecision(2) << fixed; 
    cout << "The total monetary profit:" << setw(5) << "$ " << profit << endl; 
    cout << "The net monetary profit:" << setw(7) << "$ " << profitMinusFee << endl; 
    cout << "Total paid to movie maker:" << setw(5) << "$ " << paidToMovieMaker << endl; 

    return 0; 
    } 

Answer 1

我認爲你的問題是你設置美元符號的寬度而不是你的數字。

這似乎是解決這個問題對我來說：

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

using namespace std; 

int main() { 

    string film = ""; 

    int set1 = 0; 
    int set2 = 0; 
    // the cinema always takes this 20% cut. 
    const double CINEMA_FEE = 0.20; 
    double profit = 0; 
    double profitMinusFee = 0; 
    double paidToMovieMaker = 0; 

    cout << "What is the name of the film: "; 
    getline(cin, film); 

    cout << "How many tickets for set1 sold: "; 
    cin >> set1; 

    cout << "How many tickets for set2 sold: "; 
    cin >> set2; 

    cout << "Film Name:" << setw(20) << "\"" << film << "\"" << endl; 
    cout << "Set1 tickets sold:" << setw(16) << set1 << endl; 
    cout << "Set2 tickets sold:" << setw(16) << set2 << endl; 

    set1 *= 10; 
    set2 *= 6; 
    profit = set1 + set2; 
    profitMinusFee = profit * CINEMA_FEE; 
    paidToMovieMaker = profit - profitMinusFee; 
    // needs to always show two decimal points and fixed 
    cout << setprecision(2) << fixed; 
    cout << "The total monetary profit: $ " << setw(10) << profit << endl; 
    cout << "The net monetary profit : $ " << setw(10) << profitMinusFee << endl; 
    cout << "Total paid to movie maker: $ " << setw(10) << paidToMovieMaker << endl; 

    return 0; 
} 

記住setw()會影響之後談到的東西。