Rabattcode .. Wo bin ich falsch gelaufen?

Question

Dieser Code wurde entwickelt, um den endgültigen Preis eines Artikels basierend auf der Kundenmenge zu ermitteln. Ich habe bereits in den Gleichungen hinzugefügt, aber wenn es ausgeführt wird, werden der Rabatt und der Endpreis nicht richtig ausgewertet. Wenn jemand weiß, wo ich im Pseudocode falsch gelaufen bin, wäre das sehr hilfreich.

using namespace std; 
int main() { 

    // Variables 
    double Retail, quantity, discount1, discount2, discount3, discount4, TotalCost1, TotalCost2, TotalCost3, TotalCost4; 
    Retail = 99; 
    quantity = 0; 
    discount1 = (quantity * Retail) * .20; 
    discount2 = (quantity * Retail) * .30; 
    discount3 = (quantity * Retail) * .40; 
    discount4 = (quantity * Retail) * .50; 
    TotalCost1 = quantity - discount1; 
    TotalCost2 = quantity - discount2; 
    TotalCost3 = quantity - discount3; 
    TotalCost4 = quantity - discount4; 

    //Equations 
    cout << "Please enter the quantity of items you would like to purchase: " << endl; 
    cin >> quantity; 
    cout << "The number of items being purchased is: " << quantity << endl; 

    if (quantity <= 19) { 
     cout << "Your final price is: " << discount1 << endl; 
    } 
    if (quantity >= 20) { 
     cout << "Your final price is: " << discount2 << endl; 
    } 
    if (quantity >= 50) { 
     cout << "Your final price is: " << discount3 << endl; 
    } 
    if (quantity >= 100) { 
     cout << "Your final price is: " << discount4 << endl; 
    } 




     system("pause"); 
} 

Answer 1

Ist es nur, dass Sie Menge ist nicht als etwas außer 0 definiert, bevor Sie die Rabatte berechnen? Ich habe das Lesen Ihres Einkaufs vor den Berechnungen verschoben und bessere Ergebnisse erzielt (mit Online-Compiler).

double Retail, quantity, discount1, discount2, discount3, discount4, TotalCost1, TotalCost2, TotalCost3, TotalCost4; 
Retail = 99; 
quantity = 0; 

//Equations 
cout << "Please enter the quantity of items you would like to purchase: " << endl; 
cin >> quantity; 
cout << "The number of items being purchased is: " << quantity << endl; 

discount1 = (quantity * Retail) * .20; 
discount2 = (quantity * Retail) * .30; 
discount3 = (quantity * Retail) * .40; 
discount4 = (quantity * Retail) * .50; 
TotalCost1 = quantity - discount1; 
TotalCost2 = quantity - discount2; 
TotalCost3 = quantity - discount3; 
TotalCost4 = quantity - discount4; 


if (quantity <= 19) { 
    cout << "Your final price is: " << discount1 << endl; 
} 
if (quantity >= 20) { 
    cout << "Your final price is: " << discount2 << endl; 
} 
if (quantity >= 50) { 
    cout << "Your final price is: " << discount3 << endl; 
} 
if (quantity >= 100) { 
    cout << "Your final price is: " << discount4 << endl; 
} 


Please enter the quantity of items you would like to purchase: 
The number of items being purchased is: 19 
Your final price is: 376.2