如果else語句循環或重複，直到真

Question

我不知道如何循環或重複cin >> cashTendered如果投標金額小於所需的金額。

到目前爲止，這就是我所擁有的。

if (cashTendered > || == total) 
{ 
cout << "Your change is: $" << fixed << setprecision(2) << change << ".\n\n" 
<< "Have a great day!\n\n\n\n\n"; 
} 
else 
{ 
cout << "You did not tender enough money to cover the total cost.\n" 
<< "Please enter amount of cash tendered: $"; 
} 

所以現在我想if語句重複，直到真實。

有什麼建議嗎？

Answer 1

看看loops in c++。此外，如果條件可以縮短爲>=而不是> || ==。而且，既然你想重複，直到cashTendered> = total，你需要一個循環來檢查條件，如果cashTendered總共是<。

while (cashTendered < total) 
{ 
    cout << "You did not tender enough money to cover the total cost.\n" 
    << "Please enter amount of cash tendered: $"; 
    cin >> cashTendered; 
} 
cout << "Your change is: $" << fixed << setprecision(2) << change << ".\n\n" 
<< "Have a great day!\n\n\n\n\n"; 

Answer 2

while(true) 
{ 
    cin >> cashTendered 
    if (cashTendered >= total) 
    { 
     cout << "Your change is: $" << fixed << setprecision(2) << change << ".\n\n" 
     << "Have a great day!\n\n\n\n\n"; 
     break; 
    } 
    else 
    { 
     cout << "You did not tender enough money to cover the total cost.\n" 
     << "Please enter amount of cash tendered: $"; 
    } 
}