Golang : Find change in a combination of coins example
If you are planning to build a vending machine, self-service cashier machine or any machines that deal with money. Chances are the machine will need to have the ability to find out how much change in coins needed to be given back to the customers. Before deciding how much change needs to be given back, first the program needs to breakdown or know the combination of coins of a given value.
For example, given a 50% value of a dollar, what is the combination of coins that will make up the 50% value of a dollar? Mathematically, it should be 2 quarters.
The code that follows is an example program that will take in an integer value from 1 to 100 and prints out the change combination.
Here you go!
package main
import (
"fmt"
"os"
)
var (
amount, originalAmount, quarters, dimes, nickels, pennies int
)
func sanityCheck(input, min, max int) {
if !((input >= min) && (input <= max)) {
fmt.Printf("Input parameter must in between %d and %d.\n", min, max)
os.Exit(-1)
}
}
func main() {
fmt.Println("Enter an integer value from 1 to 100 : ")
fmt.Println("and I will show you a combination of coins")
fmt.Println("that equals to the number.")
_, err := fmt.Scanf("%d", &amount)
if err != nil {
fmt.Println(err)
}
sanityCheck(amount, 1, 100)
fmt.Println("You have entered : ", amount)
originalAmount = amount
quarters = amount / 25
amount = amount % 25
dimes = amount / 10
amount = amount % 10
nickels = amount / 5
amount = amount % 5
pennies = amount
fmt.Println("Original amount entered : ", originalAmount)
fmt.Println("Has a combination in coins of : ")
fmt.Println("Quarters : ", quarters)
fmt.Println("Dimes : ", dimes)
fmt.Println("Nickels : ", nickels)
fmt.Println("Pennies : ", pennies)
}
Sample output:
Enter an integer value from 1 to 100 :
and I will show you a combination of coins
that equals to the number.
You have entered : 100
Original amount entered : 100
Has a combination in coins of :
Quarters : 4
Dimes : 0
Nickels : 0
Pennies : 0
Enter an integer value from 1 to 100 :
and I will show you a combination of coins
that equals to the number.
2
You have entered : 2
Original amount entered : 2
Has a combination in coins of :
Quarters : 0
Dimes : 0
Nickels : 0
Pennies : 2
Enter an integer value from 1 to 100 :
and I will show you a combination of coins
that equals to the number.
88
You have entered : 88
Original amount entered : 88
Has a combination in coins of :
Quarters : 3
Dimes : 1
Nickels : 0
Pennies : 3
References:
https://socketloop.com/tutorials/golang-integer-is-between-a-range
https://www.socketloop.com/tutorials/golang-how-to-read-integer-value-from-standard-input
https://www.socketloop.com/tutorials/golang-how-to-check-if-input-from-os-args-is-integer
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+6.1k Golang : Extract unicode string from another unicode string example
+20.6k Swift : Convert (cast) Int to int32 or Uint32
+12.8k Golang : Sort and reverse sort a slice of bytes
+5.5k Javascript : How to loop over and parse JSON data?
+4.5k Golang : Valued expressions and functions example
+14.1k Golang : Compress and decompress file with compress/flate example
+46.7k Golang : Marshal and unmarshal json.RawMessage struct example
+7.1k Web : How to see your website from different countries?
+26.9k Golang : Convert file content into array of bytes
+19.6k Golang : Example for DSA(Digital Signature Algorithm) package functions
+15.7k Golang : Force download file example
+14.7k How to automatically restart your crashed Golang server