Question

Can you please explain in detail what each line of code stands for in the Main method

import java.util.Scanner;

public class CashRegister {

private static Scanner scanner = new Scanner(System.in);

private static int dollarBills[] = {1, 2, 5, 10, 20, 50, 100};
private static int cents[] = {25, 10, 5, 1};

public static void main(String[] args) {

double totalAmount = 0;
int count = 0;
for (int i = 0; i < dollarBills.length; i++) {
count = getBillCount("How many $" + dollarBills[i] + " bills do you have");
totalAmount += count * dollarBills[i];
}

for (int i = 0; i < cents.length; i++) {
count = getBillCount("How many " + cents[i] + " cents do you have");
totalAmount += count * cents[i]/100.0;
}

System.out.printf("You have total $%.2f in your register\n",totalAmount);
if(totalAmount>150){
System.out.printf("Deposit Amount $%.2f\n",(totalAmount-150));
}else if(totalAmount==150){
System.out.println("You have exactly $150. You dont have any deposit.");
}else {
System.out.println("You have less than $150 in your register.");
}
}

private static int getBillCount(String message) {

int count = 0;
while (true) {
System.out.print(message + ": ");
try {

count = scanner.nextInt();
} catch (Exception exception) {
System.out.println("Invalid number passed.");
}

if (count < 0) {
System.out.println("Invalid number passed.");
} else {
return count;
}
}

}
}

Answer 1

import java.util.Scanner;

public class CashRegister {

   private static Scanner scanner = new Scanner(System.in);
   //here we are creating an array named dollarBills which contain all type of dollars
   private static int dollarBills[] = {1, 2, 5, 10, 20, 50, 100};
   //here we are creating an array named cents which contain all type of cents
   private static int cents[] = {25, 10, 5, 1};

   public static void main(String[] args)
   {
       //intially assign the total amount to 0
       double totalAmount = 0;
       //the count will also be 0
       int count = 0;
       //iterating over the array dollarBills to find the number of dollars of each type
       for (int i = 0; i < dollarBills.length; i++)
       {
           //this count variable is to find the total number of dollars of each type suppose if we have 10 coins of 1$ the count will be 10
           count = getBillCount("How many $" + dollarBills[i] + " bills do you have");
           //we find the total amount based on the count and the value of the coin suppose if we have 10 coins of 1 dollar it will be (1*10) and we are adding it to fint the total amount
           totalAmount += count * dollarBills[i];
       }
       //now int the same way we are iterating through cents array which contains all types of cents
       for (int i = 0; i < cents.length; i++)
       {
           //it is same as of count in dollar bills but it is for cents
           count = getBillCount("How many " + cents[i] + " cents do you have");
           //it is also same as total amount in dollar bills since they are cents we are dividing with 100
           totalAmount += count * cents[i]/100.0;
       }
       //printing the total amount that you have
       System.out.printf("You have total $%.2f in your register\n",totalAmount);
       if(totalAmount>150)
       {
           //if the amount is greater than 150 we are depositing amount-150 dollars
           System.out.printf("Deposit Amount $%.2f\n",(totalAmount-150));
       }
       else if(totalAmount==150)
       {
           //if the amount is equal to 150 there is no money to deposit
           System.out.println("You have exactly $150. You dont have any deposit.");
       }
       else
       {
           //it doesn't have the minimum money in the register
           System.out.println("You have less than $150 in your register.");
       }
   }
   private static int getBillCount(String message)
   {

       int count = 0;
       while (true)
       {
           System.out.print(message + ": ");
           try
           {
               count = scanner.nextInt();
           }
           catch (Exception exception)
           {
               System.out.println("Invalid number passed.");
           }

           if (count < 0)
           {
               System.out.println("Invalid number passed.");
           }
           else
           {
               return count;
           }
       }

   }
}

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