08. On Time for the Exam

package main
import (
    "fmt"
    "math"
)

func main() {
    var hourExam, minuteExam, hourStudent, minuteStudent int
    fmt.Scanln(&hourExam)
    fmt.Scanln(&minuteExam)
    fmt.Scanln(&hourStudent)
    fmt.Scanln(&minuteStudent)

    var examMinutes = hourExam * 60 + minuteExam
    var studentMinutes = hourStudent * 60 + minuteStudent
    var time = int(math.Abs(float64(studentMinutes) - float64(examMinutes)))

    if (studentMinutes > examMinutes) {
        fmt.Println("Late")
        if (time < 60) {
            fmt.Printf("%d minutes after the start", time)
        } else {
            fmt.Printf("%d:%02d hours after the start", time / 60, time % 60)
        }
    } else {
        if (time <= 30) {
            fmt.Println("On time")
        } else {
            fmt.Println("Early")
        }
        if (time != 0) {
            if (time < 60) {
                fmt.Printf("%d minutes before the start", time)
            } else {
                fmt.Printf("%d:%02d hours before the start", time / 60, time % 60)
            }
        }
    }
}