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How to Get Float64 Type Random Number in Golang?
  • Last Updated : 01 Apr, 2020

Go language provides inbuilt support for generating random numbers of the specified type with the help of a math/rand package. This package implements pseudo-random number generators. These random numbers are generated by a source and this source produces a deterministic sequence of values every time when the program run. And if you want to random numbers for security-sensitive work, then use the crypto/rand package.
You are allowed to generate a pseudo-random number of float64 in [0.0, 1.0) from the default source with the help of the Float64() function provided by the math/rand package. So, you need to add a math/rand package in your program with the help of the import keyword.

Syntax:

func Float64() float64

Let us discuss this concept with the help of the given examples:

Example 1:




// Golang program to illustrate
// how to get a random number
package main
  
import (
    "fmt"
    "math/rand"
)
  
// Main function
func main() {
  
    // Finding random numbers of float64 type
    // Using Float64() function
    res_1 := rand.Float64()
    res_2 := rand.Float64()
    res_3 := rand.Float64()
  
    // Displaying the result
    fmt.Println("Random Number 1: ", res_1)
    fmt.Println("Random Number 2: ", res_2)
    fmt.Println("Random Number 3: ", res_3)
}

Output:

Random Number 1:  0.6046602879796196
Random Number 2:  0.9405090880450124
Random Number 3:  0.6645600532184904

Example 2:




// Golang program to illustrate the
// use of the random numbers
package main
  
import (
    "fmt"
    "math/rand"
)
  
// Function
func floatrandom(value_1, value_2 float64) float64 {
    return value_1 + value_2 + rand.Float64()
}
  
// Main function
func main() {
  
    // Getting result from floatrandom() function
    res1 := floatrandom(34, 56)
    res2 := floatrandom(30, 50)
    res3 := floatrandom(100, 500)
  
    // Displaying results
    fmt.Println("Result 1: ", res1)
    fmt.Println("Result 2: ", res2)
    fmt.Println("Result 3: ", res3)
}

Output:

Result 1:  90.60466028797961
Result 2:  80.94050908804502
Result 3:  600.6645600532185



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