自动售货机项目

Question

我需要帮助写这个程序，我是相当新的C和C++。请帮我开始。我不知道从哪里开始，但我已经尽力了。我需要写一个自动售货机程序。

1. 在屏幕上显示饮料列表
2. 允许用户退出或选择饮料
3. 如果用户选择了饮料，他或她将输入要插入机器的钱的数量。

#include<stdio.h>
#define system

void menu(void);
void chocolate(void);
void price(void);
void change(void);
void end(void);


int choc[10]={0,1,2,3,4,5,6,7,8,9};


int main()
{
 int intro;
 int option;
 int choice;
 int money;
 int payment;

e: menu();

 printf("Enter Your Option: ");
 scanf("%d",&intro);
 printf("\n");

 if(intro==1)
 {

w:  printf("The Chocolates\n\n");
  printf("1.Choose Chocolate\n");
  printf("2.View A Price To Be Paid\n");
  printf("3.Back To Main Menu\n\n");

  printf("Rules: Machine can only receive RM1 and RM5 only! \n\n\n");

  printf("Enter Your Option: ");
  scanf("%d",&option);
  printf("\n\n");

  if(option==1)
  {
   system("cls");
   printf("Name list of chocolate: ");
   printf("\n\n");
   printf("1. Cadburry Black Forest");          printf("\tRM3.00\n");
   printf("2. Kitkat");                         printf("\t\t\tRM2.00\n");
   printf("3. Crispy");                         printf("\t\t\tRM2.00\n");
   printf("4. Crunch");                         printf("\t\t\tRM2.00\n");
   printf("5. Mars");                           printf("\t\t\tRM2.00\n");
   printf("6. Kinder Bueno");                   printf("\t\tRM2.00\n");
   printf("7. White Kinder Bueno");             printf("\t\tRM2.00\n");
   printf("8. Milky Bar");                      printf("\t\t\tRM2.00\n");
   printf("9. M&M");                            printf("\t\t\t\tRM2.00\n");
   printf("10. Choki Choki");                    printf("\t\t\tRM2.00\n");
   printf("\n\n");

   printf("Choose Chocolate: ");
   scanf("%d",&choice);
   printf("\n\n");

   switch(choice)
   {
    case 0 :
     chocolate();
     printf("You choose Cadburry Black Forest\n\n");
     goto w;
    case 1 :
     chocolate();
     printf("You choose Kitkat\n\n");
     goto w;
    case 2 :
     chocolate();
     printf("You choose Crispy\n\n");
     goto w;
    case 3 :
     chocolate();
     printf("You choose Crunch\n\n");
     goto w;
    case 4 :
     chocolate();
     printf("You choose Mars\n\n");
     goto w;
    case 5 :
     chocolate();
     printf("You choose Kinder Bueno\n\n");
     goto w;
    case 6 :
     chocolate();
     printf("You choose White Kinder Bueno\n\n");
     goto w;
    case 7 :
     chocolate();
     printf("You choose Milky Bar\n\n");
     goto w;
    case 8 :
     chocolate();
     printf("You choose M&M\n\n");
     goto w;
    case 9 :
     chocolate();
     printf("You choose Choki Choki\n\n");
     goto w;

    default : goto e;
   }
  }
  else if(option==2)
  {
   printf("View A Price To Be Paid: ");
   scanf("%d",&choice);
   printf("\n\n");

   switch(choice)
   {
    case 0 :
     price();
     printf("RM3.00\n\n");
     goto w;
    case 1 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 2 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 3 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 4 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 5 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 6 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 7 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 8 :
     price();
     printf("RM2.00\n\n");
     goto w;
    case 9 :
     price();
     printf("RM2.00\n\n");
     goto w;

     default : goto e;
   }
  }
  else
   goto e;
 }

 else if(intro==2)
 {
  printf("Enter your money: ");
  scanf("%d",&money);
  printf("\n\n");

   if(choice==0)
   {
    printf("Your payment is RM3");
    printf("\n\n");
    choc[0]=payment;
    goto e;
   }
   if(choice==1)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[1]=payment;
    goto e;
   }
   if(choice==2)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[2]=payment;
    goto e;
   }
   if(choice==3)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[3]=payment;
    goto e;
   }
   if(choice==4)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[4]=payment;
    goto e;
   }
   if(choice==5)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[5]=payment;
    goto e;
   }
   if(choice==6)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[6]=payment;
    goto e;
   }
   if(choice==7)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[7]=payment;
    goto e;
   }
   if(choice==8)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[8]=payment;
    goto e;
   }
   if(choice==9)
   {
    printf("Your payment is RM2");
    printf("\n\n");
    choc[9]=payment;
    goto e;
   }
   else
   {
    printf("ERROR!\n\n");
    goto e;
   }
 }

 else if(intro==3)
 {
 change();
 goto e;
 }

 else if(intro==4)
 {
  printf("Enjoy it!");

   if(choice==0)
   {
    printf("Thank you and enjoy your Cadburry Black Forest!");
    printf("\n\n");
    choc[0]=0;
    goto e;
   }
   if(choice==1)
   {
    printf("Thank you and enjoy your Kitkat!");
    printf("\n\n");
    choc[1]=0;
    goto e;
   }
   if(choice==2)
   {
    printf("Thank you and enjoy your Crispy!");
    printf("\n\n");
    choc[2]=0;
    goto e;
   }
   if(choice==3)
   {
    printf("Thank you and enjoy your Crunch!");
    printf("\n\n");
    choc[3]=0;
    goto e;
   }
   if(choice==4)
   {
    printf("Thank you and enjoy your Mars!");
    printf("\n\n");
    choc[4]=0;
    goto e;
   }
   if(choice==5)
   {
    printf("Thank you and enjoy your Kinder Bueno!");
    printf("\n\n");
    choc[5]=0;
    goto e;
   }
   if(choice==6)
   {
    printf("Thank you and enjoy your White Kinder Bueno!");
    printf("\n\n");
    choc[6]=0;
    goto e;
   }
   if(choice==7)
   {
    printf("Thank you and enjoy your Milky Bar!");
    printf("\n\n");
    choc[7]=0;
    goto e;
   }
   if(choice==8)
   {
    printf("Thank you and enjoy your M&M!");
    printf("\n\n");
    choc[8]=0;
    goto e;
   }
   if(choice==9)
   {
    printf("Thank you and enjoy your Choki Choki!");
    printf("\n\n");
    choc[9]=0;
    goto e;
   }
   else
   {
    printf("Error! Try Again.\n\n");
    goto e;
   }
 }
  else
  end();

}

void menu(void)
{
 printf("|WELCOME TO CHOCOLATES VENDING MACHINE|\n\n");

 printf("1.The Chocolates\n");
 printf("2.Login To Your Account\n");
 printf("3.View Change\n");
 printf("4.Exit Vending Machine\n");
 printf("5.Exit Program\n\n");
}

void chocolate(void)
{
 int u[30];
 char o[30];
 FILE *choclot;
 choclot=fopen("parking.txt","a");
 printf("Your Chocolate: ");
 scanf("%s",&o);
 printf("Total Price: ");
 scanf("%d",&u);
 fprintf(choclot,"Chocolate: %s Total Price: %d\n\n",o,u);
 fclose(choclot);
}

void change(void)
{
 int i;
 printf("Your Balance: \n\n");
 for(i=0;i<10;i++)
  printf("%d",choc[i]);
  printf("\n\n\n\n");
}

void end(void)
{
 system("cls");
 printf("\t\t\tTHANK YOU FOR USING THIS SERVICES\n");
  printf("\t\t\t\t  Visit Us At \n\n");
  printf("\t\t\t    vendingmachine.com.my\n\n\n");
  printf(" First Programmer : Adawiyah\n");
  printf(" First Programmer : Vijayah Santhi\n");
} 

我的程序正确吗？我的程序整洁有序吗？后藤的说法有那么糟吗？对不起，我的英语不好。我正在尽力在这几天内完成我的项目。下周我要向我的讲师介绍一下。

抱歉打扰你了。我不知道怎么在这里复制和粘贴。

Answer 1

在你的第一次尝试中，你的问题是你从他们输入的钱中减去了他们选择的数字，而不是他们选择的饮料的成本。您可以简单地修改您的程序：

1. 创建一个名为float的新变量cost。
2. 在每个case中，在break之前，将cost设置为他们选择的饮料的成本。
3. 而不是： 变化=金钱-选择； 你会想： 变更=货币成本；

另一个您无法解决的问题(如果有更多的钱而不是必需的话，请显示更改；如果没有则显示需要额外的多少)是相当简单的。首先，你可以看到是否有足够的钱：

if(money >= cost) {
    // There's enough money.
}else{
    // There's not enough money.
}

然后，您可以适当地打印：

if(money >= cost) {
    printf("Change: %.2f\n", money - cost);
}else{
    printf("You need RM%.2f more.\n", cost - money);
}

我没有足够的时间来检查您的最新代码，但您的第一次尝试，虽然它可以有一些进一步的改进，其他人在该线程中，离您需要它的地方不远。