fmt.Printf("%2d / %2d = %.2f \n" ,a, b, float64(a)/float64(b) ) [강제형변환]

package main
import "fmt"
//------------------------- << Function >> -------------------------------
func add(a int, b int) {
       fmt.Println(" ---------<< addition start >>-----------")
       fmt.Printf("%2d + %2d = %2d \n" ,a, b, a+b )
}
func sub(a int, b int) {
       fmt.Println(" ---------<< subtraction start >>-----------")
       fmt.Printf("%2d - %2d = %2d \n" ,a, b, a-b )
}
func mul(a int, b int) {
       fmt.Println(" ---------<< multiplication start >>-----------")
       fmt.Printf("%2d x %2d = %2d \n" ,a, b, a*b )
}
func div(a int, b int) {
       fmt.Println(" ---------<< dividen start >>-----------")
       fmt.Printf("%2d / %2d = %.2f \n" ,a, b, float64(a)/float64(b) )
}
//-------------------------------------------------------------------------
func main() {
       var leftV, rightV int
       fmt.Print("leftV input >>>")
       fmt.Scanf("%d", &leftV)
       fmt.Print("rightV input >>>")
       fmt.Scanf("%d", &rightV)
       add(leftV, rightV)
       sub(leftV, rightV)
       mul(leftV, rightV)
       div(leftV, rightV)
}