如何在if语句之外的if语句中使用变量的值？

Question

我的代码就像一个收银机，其中输入了产品代码，并且会对其进行结算并打印收据。当我执行我的程序时，价格似乎没有显示，也没有在收据上加起来。是因为我的priceA，priceB等，而且价格的计算是在if语句中吗？如果是这样，我如何在if语句之外使用变量值？

   #include "stdafx.h"
#include <iostream>
#include <stdio.h>



int main ()
{
    using namespace std;


  cout << "Welcome to SM Supermarket!\n";
  int code = 0;

  string product[10];
  product[0] = "Hagen Daaz";
  product[1] = "Bounty Tissue";
  product[2] = "Chips Ahoy Cookies";
  product[3] = "Tide Laundry Detergent";
  product[4] = "Lays Original Chips";
  product[5] = "Sunny D Orange Juice";
  product[6] = "Organic Bananas";
  product[7] = "Oreo Cookies";
  product[8] = "Red Delicious Apples";
  product[9] = "Extra Cheesy Kraft Dinner";

   int priceA = 0, priceB = 0, priceC = 0, priceD = 0, priceE = 0, priceF = 0, priceG = 0, priceH = 0, priceI = 0, priceJ = 0;

 // while (code != 000){
  cout << "Please enter the barcode of your item\n";


  cin >> code;

  int amount = 0;
  cout << "How many do you want to purchase?\n";


  cin >> amount;



      if (code == 0123){
      priceA = 7 * amount;
     printf("%s\n",product[0].c_str());
      }

  else if (code == 0124){
      priceB = 10 * amount;
  printf("%s\n",product[1].c_str());
  }

  else if (code == 0125){
      priceC = 3 * amount;
  printf("%s\n",product[2].c_str());
  }

  else if (code == 0126){
      priceD = 6 * amount;
  printf("%s\n",product[3].c_str());
  }

  else if (code == 0127){
      priceE = 2 * amount;
  printf("%s\n",product[4].c_str());
  }

  else if (code == 0133){
      priceF = 3 * amount;
  printf("%s\n",product[5].c_str());
  }

  else if (code == 0134){
      priceG = 5 * amount;
  printf("%s\n",product[6].c_str());
  }

  else if (code == 0130){
     priceH = 2 * amount;
  printf("%s\n",product[7].c_str());
  }

  else if (code == 0131){
      priceI = 3 * amount;
  printf("%s\n",product[8].c_str());
  }

  else if (code == 0132){
     priceJ = 4 * amount;
  printf("%s\n",product[9].c_str());
  }
  //} 

  int coupon = 0;
  //while (coupon != 000){
      cout << "Please enter your coupon code, if you do not have any, please press '0'. Press '000' when finished entering coupon(s)\n";



  cin >> coupon;

  if (coupon == 051){
      cout << "50% discount of 'Bounty Tissue'\n";

       priceB = priceB / 2;
  }
  else if (coupon == 017){
      cout << "$2 off any Hagen Daaz product\n";

       priceA = priceA - 2;
  }
  else if (coupon == 046){
      cout << "$1 off two Lays original Chips\n";

       priceE = priceE * 2 - 1;
  }
  else if (coupon == 035){
      cout << "$1 off any Sunny D product\n";

      priceF = priceF - 1;
  }

  else if (coupon == 0){
      cout << "Your purchase is being processed\n";
  }
  //}


  int bags = 0; 
  cout << "How many bags would you like to purchase(1 bag/$1 each)?\n";

  cin >> bags;

  bags = bags * 1;


  int subtotal = priceA + priceB + priceC + priceD + priceE + priceF + priceG + priceH + priceI + priceJ + bags;
  cout << "Subtotal:\n\n " << subtotal;
  double total = subtotal * 1.1;
  cout << "Total:\n\n " << total;

  int payment = 0;
  int pin = 0;
  double change = 0;
  double cash = 0;

  cout << "Would you like to pay with debit or cash? Press '1' for debit and '2' for cash\n";

  cin >> payment;


      if (payment == 1){
          cout << "Enter your pin number: ";
          cin >> pin;
          cout << "Approved. Your purchase is processing...\n";
      }
      else if (payment == 2){
          cout << "Please enter the amount you are paying with:\n";
          cin >> cash;
          change = cash - total;
      }

  cout << "Thank you for your purchase. Your reciept is printing...\n";
  cout << "<<<<<<<<<<<<<<<<<<<<<SM Supermarket>>>>>>>>>>>>>>>>>>>>>\n";
  cout << " Cashier: Samantha & Madeleine\n";
  cout << "\n";
  cout << "\n";
  cout << "--------------------------------------------------------\n";
  printf("%s\n",product[0].c_str());
  cout << "$" << priceA << "\n";
  printf("%s\n",product[1].c_str());
  cout << "$" << priceB << "\n";
  printf("%s\n",product[2].c_str());
  cout << "$" << priceC << "\n";
  printf("%s\n",product[3].c_str());
  cout << "$" << priceD << "\n";
  printf("%s\n",product[4].c_str());
  cout << "$" << priceE << "\n";
  printf("%s\n",product[5].c_str());
  cout << "$" << priceF << "\n";
  printf("%s\n",product[6].c_str());
  cout << "$" << priceG << "\n";
  printf("%s\n",product[7].c_str());
  cout << "$" << priceH << "\n" ;
  printf("%s\n",product[8].c_str());
  cout << "$" << priceI << "\n";
  printf("%s\n",product[9].c_str());
  cout << "$" << priceJ << "\n";
  cout << "\n";
  cout << "Bags";
  cout << "$" << bags;
  cout << "\n";
  cout << "-----------------";
  cout << "Subtotal: " << subtotal << "\n";
  cout << "Total: " << total << "\n";
  cout << "Amount Given: " << cash << "\n";
  cout << "Change: " << change << "\n";
  cout << "-----------------";
  cout << "Thanks for shopping at SM Supermarket!";
  cout << "***************************************";
  cout << "Please press '1' to exit. Have a nice day!";
  int exit = 0;
  cin >> exit;
  }