Question

I'm writing a program using EasyReader class. The program wil give me the how much money is left. e.g. someone paid 50 pounds for their 20 pounds worth of groceries so the output will be 30 pounds. my question is, I want it to print out how the change should be made up. how many 10 pounds, 5 pounds, 2 pound and so on, is in the change. how should I write the program

Answer 1

Since you just need the logic to break the change into several small units, I'm going to tell you how can you do the same,

Before we begin, you should be knowing the terms division and modulus. Let me give you a little brief, in programming, a/b(read as division) gives us the quotient and a%b(read as modulus) gives us the reminder.

For example, 5/2 = 2 and 5 % 2= 1

Firstly let us assume that we want to break our change into 4 small units i.e. 10,5,2,1.

• we have to first calculate change / 10.
• If it is greater than 0 then we would save the value of change / 10 and calculate change % 10. From here we would get the reminder. Now change = reminder.
• If it is 0, we repeat the same with 5,2 and 1.
• We stop when our change becomes 0

An example would clear.

So suppose if our change is 47,

• 47 / 10 = 4 which is greater than 0.
• Hence we save the value 4, it means that we need 4 coins of 10 pounds in our change. Now 47 % 10 = 7. So now change = 7
• 7 /10 = 0. so we go to calculate 7 / 5.
• 7 / 5 = 1. so we need 4 coins of 10 pounds and 1 coin of 5 pounds in our change. Now 7 % 5 = 2. So now change = 2.
• 2 / 10 = 0 and 2 / 5 = 0. So we go to  calculate 2 / 2
• 2 / 2 = 1, so we need 4 coins of 10 pounds, 1 coin of 5 pounds and 1 coin of 2 pounds n our change.
• Now, 1 % 2 = 0. So. now change = 0 and since change became 0. we stopped.

Solution ends.

Please comment and let me know if you have any further doubts. Please upvote this answer if you like it.

Thank you.

Have a good day.