# math.Jn() Function in Golang With Examples

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 order-n Bessel function of the first kind with the help of Jn() 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 Jn() function.

Syntax:

`func Jn(a int, b float64) float64`

Example 1:

 `// Golang program to illustrate ` `// the math.Jn() function ` `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding order-n Bessel  ` `    ``// function of the first kind ` `    ``// Using Jn() function ` `    ``res_1 := math.Jn(1, math.Inf(-1)) ` `    ``res_2 := math.Jn(3, math.Inf(1)) ` `    ``res_3 := math.Jn(4, 5) ` `    ``res_4 := math.Jn(1, math.NaN()) ` ` `  `    ``// Displaying the result ` `    ``fmt.Printf(``"\nResult 1: %.2f"``, res_1) ` `    ``fmt.Printf(``"\nResult 2: %.2f"``, res_2) ` `    ``fmt.Printf(``"\nResult 3: %.2f"``, res_3) ` `    ``fmt.Printf(``"\nResult 4: %.2f"``, res_4) ` ` `  `} `

Output:

```Result 1: 0.00
Result 2: 0.00
Result 3: 0.39
Result 4: NaN
```

Example 2:

 `// Golang program to illustrate ` `// the math.Jn() function ` `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding order-n Bessel  ` `    ``// function of the first kind ` `    ``// Using Jn() function ` `    ``nvalue_1 := math.Jn(2, 3.3) ` `    ``nvalue_2 := math.Jn(4, 5.6) ` ` `  `    ``// Sum of the given numbers ` `    ``res := nvalue_1 + nvalue_2 ` `    ``fmt.Printf(``"%.2f + %.2f = %.2f"``, ` `           ``nvalue_1, nvalue_2, res) ` ` `  `} `

Output:

`0.48 + 0.39 = 0.87`

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