A solution for fixing a librarian's problem (source of problem : https://www.hackerrank.com/challenges/library-fine)

librarian.go

package main

import "fmt"

const(
    FINE_DAY = 15
    FINE_MONTH = 500
    FINE_YEAR_FIX = 10000
    NO_FINE = 0
)

func main() {
    
    fine := NO_FINE
    var adY, adM, adD int
    var edY, edM, edD int
    
    fmt.Scanf("%d %d %d", &adD, &adM, &adY)
    fmt.Scanf("%d %d %d", &edD, &edM, &edY)
    
    if adY > edY {
        fine = FINE_YEAR_FIX
    } else if adM > edM && adY == edY {
        months := (adM - edM)
        if months > 0 {
            fine = months * FINE_MONTH
        }
    } else if adM == edM && adY == edY {
        days := (adD - edD)
        if days > 0 {
            fine = days * FINE_DAY
        }
    }
    
    fmt.Println(fine)
}