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math.Ilogb() Function in Golang With Examples

Last Updated : 13 Apr, 2020
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Go language provides inbuilt support for basic constants and mathematical functions to perform operations on the numbers with the help of the math package. You can find the binary exponent of the specified number as an integer with the help of ILogb() function provided by the math package. So, you need to add a math package in your program with the help of the import keyword to access the ILogb() function.

Syntax:

func Ilogb(a float64) int
  • If Ilogb(┬▒Inf), then this function will return MaxInt32.
  • If Ilogb(0), then this function will return MinInt32.
  • If Ilogb(NaN), then this function will return MaxInt32.

Example 1:




// Golang program to illustrate
// the math.Ilogb() function
package main
  
import (
    "fmt"
    "math"
)
  
// Main function
func main() {
  
    // Finding binary exponent of 
    // the given number as an integer
    // Using Ilogb() function
    res_1 := math.Ilogb(math.Inf(-1))
    res_2 := math.Ilogb(math.Inf(1))
    res_3 := math.Ilogb(0)
    res_4 := math.Ilogb(1)
    res_5 := math.Ilogb(math.NaN())
  
    // Displaying the result
    fmt.Printf("\nResult 1: %d", res_1)
    fmt.Printf("\nResult 2: %d", res_2)
    fmt.Printf("\nResult 3: %d", res_3)
    fmt.Printf("\nResult 4: %d", res_4)
    fmt.Printf("\nResult 5: %d", res_5)
}


Output:

Result 1: 2147483647
Result 2: 2147483647
Result 3: -2147483648
Result 4: 0
Result 5: 2147483647

Example 2:




// Golang program to illustrate
// the math.Ilogb() function
package main
  
import (
    "fmt"
    "math"
)
  
// Main function
func main() {
  
    // Finding binary exponent of 
    // the given number as an integer
    // Using Ilogb() function
    nvalue_1 := math.Ilogb(math.Inf(-1))
    nvalue_2 := math.Ilogb(math.Inf(1))
  
    // Sum of the given numbers
    res := nvalue_1 + nvalue_2
    fmt.Printf("%d + %d = %d"
       nvalue_1, nvalue_2, res)
  
}


Output:

2147483647 + 2147483647 = -2


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