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Constants

This Go code demonstrates the use of constants, basic arithmetic operations, and a function from the math package. Let's go through each part of the code:
package main
import (
"fmt"
"math"
)
// Declare a constant 's' with type string and initialize it with the value "constant"
const s string = "constant"
func main() {
// Print the value of the constant 's'
fmt.Println(s)
// Declare a constant 'n' and initialize it with the value 500000000
const n = 500000000
// Declare a constant 'd' and initialize it with the result of the expression 3e20 / n
const d = 3e20 / n
fmt.Println(d)
// Print the value of 'd' after converting it to int64
fmt.Println(int64(d))
// Print the result of the sine function applied to 'n' from the math package
fmt.Println(math.Sin(n))
}
When you run this Go program, it will output the values of the constants and the result of the mathematical operations to the console.
The output should be something like:
constant
6e+11
600000000000
-0.28470407323754404

Explanation:

  1. 1.
    const s string = "constant": Declares a constant named s of type string and initializes it with the value "constant". Constants in Go are similar to variables but cannot be reassigned after their initial declaration.
  2. 2.
    fmt.Println(s): Prints the value of the constant s to the console.
  3. 3.
    const n = 500000000: Declares a constant named n and initializes it with the value 500000000.
  4. 4.
    const d = 3e20 / n: Declares a constant named d and initializes it with the result of the expression 3e20 / n. The constant d is a floating-point number.
  5. 5.
    fmt.Println(d): Prints the value of the constant d to the console.
  6. 6.
    fmt.Println(int64(d)): Prints the value of d after converting it to an int64. This conversion is necessary because d is a floating-point number, and math.Sin expects an argument of type float64 or float32.
  7. 7.
    fmt.Println(math.Sin(n)): Prints the result of the sine function applied to the constant n using the Sin function from the math package.
Last modified 1mo ago