这是计算器程序，如何为未知数量的输入编码？

Question

This program is to do different calculations.right now it is only doing the basic operations for two numbers given in main, I'm trying to upgrade it to calculate for more than 2 numbers and more like for unknown number of number given in input.

package main

import (
    "fmt"
)

func add (n int , m int) int {
     sum := n + m
     return sum
}
func sub (n int , m int) int {
     diff := n - m
     return diff
}
func mul (n float32 , m float32) float32 {
     pro := n * m
     return pro
}

func div (n float32 , m float32) float32 {
     quo := n / m
     return quo
}

func main() {
    fmt.Println(add(4,6))
    fmt.Println(sub(4,6))
    fmt.Println(mul(4,6))
    fmt.Println(div(6,4))
}

Answer 1

You may use ... to accept arbitery number of arguements, Here is how your program will be then

package main

import (
    "fmt"
)

func add(m ...int) int {
    sum := 0
    for _, i := range m {
        sum += i
    }
    return sum
}
func sub(m ...int) int {
    sub := m[0]
    for _, i := range m[1:] {
        sub -= i
    }
    return sub
}
func mul(m ...float32) float32 {
    c := float32(1)
    for _, i := range m {
        c *= i
    }
    return c
}
func div(m ...float32) float32 {
    quo := m[0]
    for _, i := range m[1:] {
        quo /= i
    }
    return quo
}

func main() {
    fmt.Println(add(4, 6))
    fmt.Println(sub(4, 6))
    fmt.Println(mul(4, 6))
    fmt.Println(div(6, 4))
}

Here is go play link : https://play.golang.org/p/dWrMa-GdGj