Create a Class for Basic Calculator Operations in Golang

To create a class that can perform basic calculator operations, we can take following Steps

• We can define a Calculator class with two numbers, a and b.
• Define a member method to calculate the addition of two numbers.
• Define a member method to calculate the multiplication of two numbers.
• Define a member method to calculate the division of two numbers.
• Define a member method to calculate the subtraction of two numbers.
• In the main method, declare two variables, a and b.
• Get an instance of Calculator.
• Initialize a choice variable, based on which mathematical operations could be performed.

Example

 Live Demo

package main
import (
   "fmt"
)
type Calculator struct {
   a int
   b int
}
func (c *Calculator)Add(){
   fmt.Println("Addition of two numbers: ", c.a + c.b)
}
func (c *Calculator)Mul(){
   fmt.Println("Multiplication of two numbers: ", c.a * c.b)
}
func (c *Calculator)Div(){
   fmt.Println("Division of two numbers: ", c.a / c.b)
}
func (c *Calculator)Sub(){
   fmt.Println("Subtraction of two numbers: ", c.a - c.b)
}
func main(){
   var a, b int
   fmt.Print("Enter the first number: ")
   fmt.Scanf("%d", &a)
   fmt.Print("Enter the second number: ")
   fmt.Scanf("%d", &b)
   cal := Calculator{
      a: a,
      b: b,
   }
   c:=1
   for c>=1 {
      fmt.Println("Enter 1 for Addition: ")
      fmt.Println("Enter 2 for Multiplication: ")
      fmt.Println("Enter 3 for Division: ")
      fmt.Println("Enter 4 for Subtraction: ")
      fmt.Print("Enter 5 for Exit: ")
      fmt.Scanf("%d", &c)
      switch c {
         case 1:
            cal.Add()
         case 2:
            cal.Mul()
         case 3:
            cal.Div()
         case 4:
            cal.Sub()
         case 5:
            c = 0
            break
         default:
         fmt.Println("Enter valid number.")
      }      
   }
}

Output

Enter the first number: 7
Enter the second number: 3
Enter 1 for Addition:
Enter 2 for Multiplication:
Enter 3 for Division:
Enter 4 for Subtraction:
Enter 5 for Exit: 1
Addition of two numbers: 10
Enter 1 for Addition:
Enter 2 for Multiplication:
Enter 3 for Division:
Enter 4 for Subtraction:
Enter 5 for Exit: 2
Multiplication of two numbers: 21
Enter 1 for Addition:
Enter 2 for Multiplication:
Enter 3 for Division:
Enter 4 for Subtraction:
Enter 5 for Exit: 3
Division of two numbers: 2
Enter 1 for Addition:
Enter 2 for Multiplication:
Enter 3 for Division:
Enter 4 for Subtraction:
Enter 5 for Exit: 4
Subtraction of two numbers: 4
Enter 1 for Addition:
Enter 2 for Multiplication:
Enter 3 for Division:
Enter 4 for Subtraction:
Enter 5 for Exit: 5