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计费系统总计的输出为 0

程序问答   发布时间：2022-06-02  发布网站：大佬教程  code.js-code.com
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如何解决计费系统总计的输出为 0？

开发过程中遇到计费系统总计的输出为 0的问题如何解决？下面主要结合日常开发的经验，给出你关于计费系统总计的输出为 0的解决方法建议，希望对你解决计费系统总计的输出为 0有所启发或帮助； @H_607_2@我是一名大学一年级学生，目前我正在处理的这个程序有问题，它是关于计费系统的。我设法完成了最后一部分之外的所有工作，即打印总数、税收和最终账单。我尝试做的任何事情都会给我错误的答案或 0。请帮忙。

#include <iostream>
#include <String.h>
#include <iomanip>
#define MAX 8

using namespace std;

struct menuItemType{
    String menuItem;
    double menuprice;
};

menuItemType menuList[MAX];

voID getData();
voID showMenu();
int printcheck(voID);
//int b[8] = {0,0};

int main(){
    cout << "Welcome to Mavel's Restaurant\n\n";
    cout << "------------ Menu ------------ \n";
    showMenu();
    getData();
    int choice;
    char add;
    
    do {
    cout << "Enter choice: ";
    cin >> choice;
    
        switch (choicE){
            
            case 1:
                cout<< "You ordered Plain Egg.\n";
                break;
            case 2:
                cout<< "You ordered BACon and Egg.\n";
                break;
                
            case 3:
                cout<< "You ordered a muffin.\n";
                break;
            
            case 4:
                cout<< "You ordered french Toast.\n";
                break;
            
            case 5:
                cout<< "You ordered Fruit Basket.\n";
                break;
            
            case 6:
                cout<< "You ordered Cereal.\n";
                break;
                
            case 7:
                cout<< "You ordered Coffee.\n";
                break;
                
            case 8:
                cout<< "You ordered Tea.\n";
                break;
                
            default:
                cout<< "InvalID Choice.";
                break;  
            
        }
        
    cout<< "Would you like to order another item? [Y]es / [n]o : ";
    cin >> add;
    
    if (add == 'N'||add =='n'){
     printcheck();
}

}
while (add == 'Y'|| add == 'y');

}


voID getData(){
    
    menuList[0].menuItem = "Plain Egg";
    menuList[0].menuprice = 140.50;
    
    menuList[1].menuItem = "BACon and Egg";
    menuList[1].menuprice = 245.00;
    
    menuList[2].menuItem = "Muffin";
    menuList[2].menuprice= 295.00;
    
    menuList[3].menuItem = "french Toast";
    menuList[3].menuprice = 495.00;
    
    menuList[4].menuItem = "Fruit Basket";
    menuList[4].menuprice = 555.00;
    
    menuList[5].menuItem = "Cereal";
    menuList[5].menuprice = 385.00;
    
    menuList[6].menuItem = "Coffee";
    menuList[6].menuprice = 415.00;
    
    menuList[7].menuItem = "Tea";
    menuList[7].menuprice = 333.00;
    
}

voID showMenu(){
    cout << "[1] Plain Egg\t\t@R_674_11161@140.50\n";
    cout << "[2] BACon and Egg\t@R_674_11161@245.00\n";
    cout << "[3] Muffin\t\t@R_674_11161@295.00\n";
    cout << "[4] french Toast\t@R_674_11161@495.00\n";
    cout << "[5] Fruit Basket\t@R_674_11161@555.00\n";
    cout << "[6] Cereal\t\t@R_674_11161@385.00\n";
    cout << "[7] Coffee\t\t@R_674_11161@415.00\n";
    cout << "[8] Tea\t\t\t@R_674_11161@333.00\n\n";
}

double @R_79_10586@l = 0;

int printcheck(){
    
    getData();
    double @R_79_10586@l = 0,tax,@R_79_10586@lbill;
    
    for (int i = 0; i < 8; i++){
        
    
        @R_79_10586@l += menuList[i].menuprice;
        
    }   
    
    
    
    tax = @R_79_10586@l * 0.05; 
    @R_79_10586@lbill = @R_79_10586@l+tax; 
    
        cout << "----------------------------------------------\n";
       cout << "Tax\t\t" << tax<< endl;
       cout << "amount Due\t@R_674_11161@" << @R_79_10586@lbill << endl;
       cout << "----------------------------------------------\n";
    
    return @R_79_10586@l;
}

解决方法

@H_607_2@你的代码有点乱，通过一些小的重组你可以得到预期的结果，这是一个可能的修复，在需要的地方加上注释：

@H_607_2@Live sample

#include <iostream>
#include <String.h>
#include <iomanip>

#define MAX 8

using namespace std; // I would avoid using namespace std,explanation ahead

struct menuItemType
{
    String menuItem;
    double menuprice;
};

//menuItemType menulist[MAX]; //does not need to be global

void getData(menuItemType *menulist);
void showMenu();
int printcheck(double @R_79_10586@l); // pass the @R_79_10586@l to the printcheck() function

int main()
{
    menuItemType menulist[MAX]; // go local when possible

    cout << "Welcome to Mavel's Restaurant\n\n";
    cout << "------------ Menu ------------ \n";

    showMenu(); // here you could also pass menulist and print the menu using the data
                //it would be easier to refactor if you add a menu item,try it

    getData(menulist);
  
    int choice;
    char add;
    double @R_79_10586@l = 0;

    do
    {
        cout << "Enter choice: ";
        cin >> choice;

        // do the math in the cycle so you can keep track of the sum of SELEcted items

        if(choice > 0 && choice <= MAX)
            @R_79_10586@l += menulist[choice - 1].menuprice;

        switch (choicE) // if you want to separate logic from UI,this could 
                        // be a separate function,i.e. printChoice(choicE);
        {

        case 1:
            cout << "You ordered Plain Egg.\n";
            break;
        case 2:
            cout << "You ordered BACon and Egg.\n";
            break;

        case 3:
            cout << "You ordered a muffin.\n";
            break;

        case 4:
            cout << "You ordered French Toast.\n";
            break;

        case 5:
            cout << "You ordered Fruit Basket.\n";
            break;

        case 6:
            cout << "You ordered Cereal.\n";
            break;

        case 7:
            cout << "You ordered Coffee.\n";
            break;

        case 8:
            cout << "You ordered Tea.\n";
            break;

        default:
            cout << "Invalid Choice.";
            break;
        }

        cout << "Would you like to order another item? [Y]es / [n]o : ";
        cin >> add;

        if (add == 'N' || add == 'n') // this condition is also refactorable,you could  
                                      // simply move the print to after the loop ends
        {
            printcheck(@R_79_10586@l);
        }

    } while (add == 'Y' || add == 'y');

    //printcheck(@R_79_10586@l); //here
}

void getData(menuItemType *menulist)
{
    menulist[0].menuItem = "Plain Egg";
    menulist[0].menuprice = 140.50;

    menulist[1].menuItem = "BACon and Egg";
    menulist[1].menuprice = 245.00;

    menulist[2].menuItem = "Muffin";
    menulist[2].menuprice = 295.00;

    menulist[3].menuItem = "French Toast";
    menulist[3].menuprice = 495.00;

    menulist[4].menuItem = "Fruit Basket";
    menulist[4].menuprice = 555.00;

    menulist[5].menuItem = "Cereal";
    menulist[5].menuprice = 385.00;

    menulist[6].menuItem = "Coffee";
    menulist[6].menuprice = 415.00;

    menulist[7].menuItem = "Tea";
    menulist[7].menuprice = 333.00;
}

void showMenu()
{
    cout << "[1] Plain Egg\t\t@R_674_11161@140.50\n";
    cout << "[2] BACon and Egg\t@R_674_11161@245.00\n";
    cout << "[3] Muffin\t\t@R_674_11161@295.00\n";
    cout << "[4] French Toast\t@R_674_11161@495.00\n";
    cout << "[5] Fruit Basket\t@R_674_11161@555.00\n";
    cout << "[6] Cereal\t\t@R_674_11161@385.00\n";
    cout << "[7] Coffee\t\t@R_674_11161@415.00\n";
    cout << "[8] Tea\t\t\t@R_674_11161@333.00\n\n";
}

// now can simply print the check
int printcheck(double @R_79_10586@l)
{
    double tax = @R_79_10586@l * 0.05;
    double @R_79_10586@lbill = @R_79_10586@l + tax;

    cout << "----------------------------------------------\n";
    cout << "Tax\t\t" << tax << endl;
    cout << "amount Due\t@R_674_11161@" << @R_79_10586@lbill << endl;
    cout << "----------------------------------------------\n";

    return @R_79_10586@l; // you're not using this return value,you may aswell make the function return type void
}
@H_607_2@有关是否应使用 using namespace std; 的更多信息，请查看此链接：

@H_607_2@Why is "using namespace std;" considered bad practice?

@H_607_2@请注意，该代码仍有一些弱点，即缺乏输入验证，例如，如果在提示您输入 choice 时输入的不是数字，则说明有问题。如果您想了解更多相关信息，您可以在 SO 中找到许多主题，例如：

@H_607_2@Good input validation loop using cin - C++

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