所以我正在為學校做一個專案，但我無法讓它發揮作用。其他一切似乎都在運行，但是當我輸入用戶對 q、s、z10、z25、z5、z1 的選擇時，它會無限回圈。我無法弄清楚為什么它會一遍又一遍地運行該功能。我不太確定我只是輸入錯誤還是什么，但這是我目前唯一真正堅持的事情。這是代碼
#include<iostream>
#include<string>
using namespace std;
struct Inventory
{
int Pack_25oz;
int Pack_10oz;
int Pack_5oz;
int Pack_1oz;
};
void show_Menu();
void initialize (Inventory& I);
void add_25OZ (Inventory& I, int P25);
void add_10OZ (Inventory& I, int P10);
void add_5OZ (Inventory& I, int P5);
void add_1OZ (Inventory& I, int P1);
void Place_Order(Inventory& I, int amount);
void show (Inventory& I);
int main(){
Inventory I;
string choice;
int nop= 0;
initialize(I);
show_Menu();
cout << "Dear User! please make a choice from above menu : " << endl;
getline(cin,choice);
while(choice!="q" or choice != "Q"){
if(choice == "s"|| choice == "S"){
show(I);
}
else if(choice == "z25" || choice == "Z25"){
cout << "Enter the number of packages : \n";
cin >> nop;
add_25OZ(I, nop);
}
else if(choice == "z10" || choice == "Z10"){
cout << "Enter the number of packages : \n";
cin >> nop;
add_10OZ(I, nop);
}
else if(choice == "z5"||choice == "Z5"){
cout << "Enter the number of packages : \n";
cin >> nop;
add_5OZ(I, nop);
}
else if(choice == "z1"|| choice == "Z1"){ // choice equal to "z1" or "Z1"
cout << "Enter the number of packages : \n" ; // prompt for number of packages
cin >> nop ; // accept user input
add_1OZ( I, nop);// call add_1OZ function
}
else if(choice == "o"||choice == "O") {
cout << "Enter the number of ounces : ";// prompt for number of ounces
int noun; // noun stands for number of ounces
cin >> noun;// accept user input
Place_Order( I, noun);
}
else if (choice == "q" || choice == "Q"){ // Output final message that the program has ended
cout << "The program has ended.";
break;
}
else
cout << "invalid comand" << endl;
};
return 0;
}
void show_Menu(){
cout << "S - Show Inventory" << endl;
cout << "Z25 - Add 25 oz packages"<< endl;
cout << "Z10 - Add 10 oz packages"<< endl;
cout << "Z5 - Add 5 oz packages"<< endl;
cout << "Z1 - Add 1 oz packages "<< endl;
cout << "O - Place order"<< endl;
cout << "Q - End"<< endl;
}
void show (Inventory& I)
{
cout << "The Inventory comprises of the following:\n 1. Pack_25oz : " << I.Pack_25oz << "\n 2.
Pack_10oz : " << I.Pack_10oz << "\n 3. Pack_5oz : " << I.Pack_5oz << "\n 4. Pack_1oz : " <<
I.Pack_1oz <<endl ;
}
void initialize (Inventory& I) {
int var = 0 ;
I.Pack_25oz = var;
I.Pack_10oz = var;
I.Pack_5oz = var;
I.Pack_1oz = var;
}
void add_25OZ (Inventory& I, int P25) {
I.Pack_25oz = P25;
}
void add_10OZ (Inventory& I, int P10) {
I.Pack_10oz = P10;
}
void add_5OZ (Inventory& I, int P5) {
I.Pack_5oz = P5;
}
void add_1OZ (Inventory& I, int P1) {
I.Pack_1oz = P1;
}
void Place_Order(Inventory& I, int amount) {
int subtract;
subtract = amount / 25;
if (I.Pack_25oz <= 0) {
cout << "Not enough packs" << endl;
} else { I.Pack_25oz -= subtract; }
amount = amount % 25;
subtract = amount / 10;
if (I.Pack_10oz <= 0) {
cout << "Not enough packs" << endl;
} else { I.Pack_10oz -= subtract; }
amount = amount % 10;
subtract = amount / 5;
if (I.Pack_5oz <= 0) {
cout << "Not enough packs" << endl;
} else { I.Pack_5oz -= subtract; }
amount = amount % 5;
subtract = amount / 1;
if (I.Pack_1oz <= 0) {
cout << "Not enough packs" << endl;
} else { I.Pack_1oz -= subtract;
cout << "Order Fufilled" << endl;
}
}
uj5u.com熱心網友回復：
看來您getline在回圈之外呼叫。所以choice永遠不會更新。
轉載請註明出處，本文鏈接：https://www.uj5u.com/qukuanlian/460681.html