# Finding Base-2 Exponential of a Number in Golang

Last Updated : 01 Apr, 2020

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 are allowed to find base-2 exponential, i.e., 2**a of the specified number with the help of Exp2() 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 Exp2() function.

Syntax:

`func Exp2(a float64) float64`
• If you pass +Inf in this function, then this function will return +Inf.
• If you pass NaN in this function, then this function will return NaN.

Example 1:

 `// Golang program to illustrate how to find ` `// base-2 exponential of the given number ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding base-2 exponential  ` `    ``// of the given number ` `    ``// Using Exp2() function ` `    ``res_1 := math.Exp2(3) ` `    ``res_2 := math.Exp2(-1) ` `    ``res_3 := math.Exp2(math.Inf(1)) ` `    ``res_4 := math.Exp2(math.NaN()) ` ` `  `    ``// Displaying the result ` `    ``fmt.Printf(``"Result 1: %.1f"``, res_1) ` `    ``fmt.Printf(``"\nResult 2: %.1f"``, res_2) ` `    ``fmt.Printf(``"\nResult 3: %.1f"``, res_3) ` `    ``fmt.Printf(``"\nResult 4: %.1f"``, res_4) ` ` `  `} `

Output:

```Result 1: 8.0
Result 2: 0.5
Result 3: +Inf
Result 4: NaN
```

Example 2:

 `// Golang program to illustrate how to find ` `// base-2 exponential of the given number ` ` `  `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding base-2 exponential ` `    ``// Using Exp2() function ` `    ``nvalue_1 := math.Exp2(7.3) ` `    ``nvalue_2 := math.Exp2(-3) ` `    ``res := nvalue_1 + nvalue_2 ` `    ``fmt.Printf(``"%.1f + %.1f = %.1f"``, ` `            ``nvalue_1, nvalue_2, res) ` ` `  `} `

Output:

`157.6 + 0.1 = 157.7 `