我应该使用一种结构来存储饮料名称,饮料成本和机器中的饮料数量。我应该创建一个包含五个结构的数组,其中的元素用名称,成本和数字初始化。程序应显示饮料列表,用户应在第一个功能中进行选择(1-6)。验证选择并按值传递回主程序。在第二个功能中,用户插入金钱并显示变化量,并且应该从机器中的饮料数量中减去一个并且循环。当用户退出时,它会显示机器获得的总金额。我的问题是将数组传递给函数。我以为我做得对,但我到处都有功能和数组的错误。有谁知道我将如何传递数组并从函数返回值?感谢
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;
struct Drink
{
string drinkName;
double cost;
int numberInMachine;
};
struct Drink options[] = {{"Cola", .75, 0}, {"Root Beer", .75, 2},
{"Lemon-Lime", .75, 10},
{"Grape Soda", .80, 3}, {"Cream Soda", .80, 20}};
int getChoice(Drink, int);
void showTransaction(Drink&);
int main()
{
const int NUM_DRINKS = 5; // Number of drink options
Drink options[NUM_DRINKS];
getChoice(Drink, value);
showTransaction(choice);
system("pause");
return 0;
}
int getChoice(Drink, choice)
{
int choice;
cout << "Enter the number(1-6) of the drink you would like: " << endl;
cout << "Drink Name Cost Number in Machine " << endl;
cout << "1. Cola .75 " << endl;
cout << "2. Root Beer .75 " << endl;
cout << "3. Lemon-lime .75 " << endl;
cout << "4. Grape Soda .80 " << endl;
cout << "5. Cream Soda .80 " << endl;
cout << "6. Quit " << endl;
cout << " Enter the number of your selection: ";
cin >> choice;
while(choice != 1 && choice != 2 && choice != 3 && choice != 4
&& choice != 5 && choice != 6)
{
cout << "Please enter a valid number 1-6" << endl;
cin >> choice;
}
return choice;
}
void showTransaction(choice)
{
double moneyIn;
double moneyOut;
if(choice ==1)
{
cout << "Enter money inserted up to $1.00: ";
cin >> moneyIn;
while(moneyIn < options[0].cost)
{
cout << "Enter correct amount" << endl;
cin >> moneyIn;
}
if(moneyIn > options[0].cost)
{
cout << "Your change is: " << (moneyIn - options[0].cost) << endl;
}
}
}
答案 0 :(得分:1)
我已修复了代码中的一些内容。我评论了大部分内容;请仔细阅读并尝试理解为什么我做了我的工作。
需要注意的主要事项是:
options
的数组,因此无需将此数组传递给任何函数,因为它们可以访问它固定代码:
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;
// Structure to hold information about drink
struct Drink
{
string drinkName;
double cost;
int numberInMachine;
};
// Essentially the machine with information about what is in it
Drink options[] = {{"Cola", .75, 0}, {"Root Beer", .75, 2}, {"Lemon-Lime", .75, 10},{"Grape Soda", .80, 3}, {"Cream Soda", .80, 20}};
int getChoice();
double showTransaction(int);
int main()
{
int choice;
double moneyEarned = 0.0;
// Figuring out what the cutomer chose
choice = getChoice();
// Figuring out how much money the machine earned
moneyEarned = showTransaction(choice);
cout << "The machine earned: $" << moneyEarned << "." << endl;
return 0;
}
int getChoice()
{
int choice;
cout << "Enter the number(1-6) of the drink you would like: " << endl;
cout << "Drink Name Cost Number in Machine " << endl;
cout << "1. Cola .75 " << options[0].numberInMachine << endl;
cout << "2. Root Beer .75 " << options[1].numberInMachine << endl;
cout << "3. Lemon-lime .75 " << options[2].numberInMachine << endl;
cout << "4. Grape Soda .80 " << options[3].numberInMachine << endl;
cout << "5. Cream Soda .80 " << options[4].numberInMachine << endl;
cout << "6. Quit " << endl;
cout << "Enter the number of your selection: ";
cin >> choice;
while(choice < 1 || choice > 6)
{
cout << "Please enter a valid number 1-6" << endl;
cin >> choice;
}
return choice;
}
double showTransaction(int choice)
{
double moneyIn;
// If there isn't enough drinks ie. more than 0, then we can't sell any
if(options[choice-1].numberInMachine < 1)
return 0.0;
cout << options[choice-1].drinkName << "costs $" << options[choice-1].cost << "." << endl;
cout << "Enter money inserted up to $1.00: ";
cin >> moneyIn;
// If they enter less money than we need
while(moneyIn < options[choice-1].cost)
{
cout << "The entered money is not enough, Please enter more: ";
cin >> moneyIn;
}
cout << "Your change is: $" << (moneyIn - options[choice-1].cost) << "." << endl;
return moneyIn;
}