邮政编码到条形码与校验位

Question

我必须编写一个程序，用户输入一个zipcode并输出带有校验位的条形码。我能够让程序打印正确的条形码，但我不确定程序是否打印条形码和结果的邮政编码。

#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main()
{

string Bar_Code(char digit)


 /* Write a program that asks the user for a zip code and prints the 
bar code. Use : for half bars, | for full bars.*/
 {
     if (digit == '0' ){
     return "||:::";
     else if (digit == '1')
     return ":::||";
     else if (digit == '2')
     return "::|:|";
     else if (digit == '3')
     return "::||:";
     else if (digit == '4')
     return ":|::|";
     else if (digit == '5')
     return ":|:|:";
     else if (digit == '6')
     return ":||::";
     else if (digit == '7')
     return "|:::|";
     else if (digit == '8')
     return "|::|:";
     else if (digit == '9')
     return "|:|::";
     else
     return "Invalid";

}


string user_input;
string result = "";
int digits[5];
int sum = 0;

cout << "Enter zipcode and the check digit: ";
    /* check digit is the sum of all the digits + check digit to make 
 the sum a multiple of 10 */
cin >> user_input;

for(int i=0; i < user_input.length();i++)
{
     digit[i] = user_input[i] - '0';
    string current_barcode = Bar_Code(user_input[i]);
    result += current_barcode;
    sum += digits[i];
}
     int remainder = sum % 10;
     int checkDigit = 10 - remainder;

     result += Bar_Code(checkDigit + '0');

     cout << checkDigit << endl;

     cout << endl;

     return 0;

  }