func (a *ArithCommand) subtract() int {
if len(a.flags.Args()) > 3 {
panic("Oops, I can only subtract 2 numbers!")
}
args := a.flags.Args()[1:3]
ret := utils.StrArrToIntArr(args)
difference := ret[0] - ret[1]
fmt.Println(difference)
return difference
}
func (a *ArithCommand) add() int {
args := a.flags.Args()[1 : len(a.flags.Args())-1]
fmt.Println(args)
sum := 0
//convert string arr to int arr
ret := utils.StrArrToIntArr(args)
//sum all numbers
for _, num := range ret {
sum = sum + num
}
fmt.Println(sum)
return sum
}