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 arc tangent of a/b, using the signs of the two to identify the quadrant of the return value with the help of Atan2() 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 Atan2() function.
Syntax:
func Atan2(b, a float64) float64
- If Atan2(b, NaN), then this method will return NaN.
- If Atan2(NaN, a), then this method will return NaN.
- If Atan2(+0, a>=0), then this method will return +0.
- If Atan2(-0, a>=0), then this method will return -0.
- If Atan2(+0, a<=0), then this method will return +Pi.
- If Atan2(-0, a<=0), then this method will return -Pi.
- If Atan2(b>0, 0), then this method will return +Pi/2.
- If Atan2(b<0, 0), then this method will return -Pi/2.
- If Atan2(+Inf, +Inf), then this method will return +Pi/4.
- If Atan2(-Inf, +Inf), then this method will return -Pi/4.
- If Atan2(+Inf, -Inf), then this method will return -3Pi/4.
- If Atan2(+Inf, +Inf), then this method will return 0.
- If Atan2(b, +Inf), then this method will return +Pi/4.
- If Atan2(b>0, -Inf), then this method will return +Pi.
- If Atan2(b<0, -Inf), then this method will return -Pi.
- If Atan2(+Inf, a), then this method will return +Pi/2.
- If Atan2(-Inf, a), then this method will return -Pi/2.
Example 1:
// Golang program to illustrate // the math.Atan2() function package main import ( "fmt"
"math"
) // Main function func main() { // Finding arc tangent
// Using Atan2() function
res_1 := math.Atan2(math.Pi/3, math.Pi/4)
res_2 := math.Atan2(math.Inf(1), 0)
res_3 := math.Atan2(math.Inf(-2), math.Inf(+2))
res_4 := math.Atan2(1, math.NaN())
res_5 := math.Atan2(math.NaN(), 0)
// Displaying the result
fmt.Printf( "\nResult 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)
fmt.Printf( "\nResult 5: %.1f" , res_5)
} |
Output:
Result 1: 0.9 Result 2: 1.6 Result 3: -0.8 Result 4: NaN Result 5: NaN
Example 2:
// Golang program to illustrate // the math.Atan2() function package main import ( "fmt"
"math"
) // Main function func main() { // Finding arc tangent
// Using Atan2() function
nvalue_1 := math.Atan2(math.Pi/3, math.Pi/4)
nvalue_2 := math.Atan2(math.Pi/6, math.Pi/3)
// Sum of the given numbers
res := nvalue_1 + nvalue_2
fmt.Printf( "%.2f + %.2f = %.2f" ,
nvalue_1, nvalue_2, res)
} |
Output:
0.93 + 0.46 = 1.39
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