# math.J0() 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-zero Bessel function of the first kind with the help of J0() 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 J0() function.

Syntax:

`func J0(a float64) float64`
• If J0(±Inf), then this function will return 0.
• If J0(0), then this function will return 1.
• If J0(NaN), then this function will return NaN.

Example 1:

 `// Golang program to illustrate ` `// the math.J0() function ` `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding order-one Bessel ` `    ``// function of the first kind ` `    ``// Using J0() function ` `    ``res_1 := math.J0(math.Inf(-1)) ` `    ``res_2 := math.J0(math.Inf(1)) ` `    ``res_3 := math.J0(5) ` `    ``res_4 := math.J0(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: -0.18
Result 4: NaN
```

Example 2:

 `// Golang program to illustrate ` `// the math.J0() function ` `package main ` ` `  `import ( ` `    ``"fmt"` `    ``"math"` `) ` ` `  `// Main function ` `func main() { ` ` `  `    ``// Finding order-zero Bessel ` `    ``// function of the first kind ` `    ``// Using J0() function ` `    ``nvalue_1 := math.J0(2.0) ` `    ``nvalue_2 := math.J0(4.1) ` ` `  `    ``// Sum of the given numbers ` `    ``res := nvalue_1 + nvalue_2 ` `    ``fmt.Printf(``"%.2f + %.2f = %.2f"``, ` `            ``nvalue_1, nvalue_2, res) ` ` `  `  `  `} `

Output:

`0.22 + -0.39 = -0.16`

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