C++ Math atan2() Function

C++ Math atan2() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math atan2()

The function finds the inverse tangent of a coordinate.

Suppose the coordinate is (x,y):

atan2(y,x) = tan^-1(y/x);

Syntax

Suppose the coordinate is (x,y). Syntax would be:

float atan2(float y, float x);
double atan2(double y, double x);
long double atan2(long double y, long double x);
Promoted atan2(Arithmetic1 y, Arithmetic x );

Parameter

y: It represents the y-coordinate value.

x: It represents the x-coordinate value.

Return value

It returns the value in the range[-?, ?] and if the values of both x and y are zero then it returns zero value.

If any argument is of integral type, it is cast to double.
If any argument is of long double type, it is cast to long double.

Example 1

Let's see a simple example when both x and y are zero.

#include 
#include
using namespace std;
int main()
{
    int x=0;
    int y=0;
    cout<<"Value of tan(y/x) is : "<

Output:

Value of tan(y/x) is : 0
Value of tan-1(y/x) is : 0

In this example, atan2() calculates the inverse tangent when both 'x' and 'y' are zero.

Example 2

Let's see a simple example when both 'x' and 'y' are of different type.

#include 
#include
using namespace std;
int main()
{
    int x=6;
    float y=7.8;
    cout<<"Value of tan(y/x) is : "<

Output:

Value of tan(y/x) is : 3.6021
Value of tan1(y/x) is : 0.915101

In this example, atan2() function finds the inverse of a tangent when x is of integer type and y is of float type.

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