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C++ Math atan() Functions

C++ Math atan() Functions 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 atan()

The function computes the inverse tangent of a number given in radian.

atan(x) = tan-1x

Syntax

Suppose a number is 'x'. Syntax would be:

float atan(float x);
double atan(double x);
long double atan(long double x);
double atan(integral x);

Note: If the value passed is an integer type, then it is cast to double.

Parameter

x: The value whose inverse tangent is to be calculated.

Return value

It returns the value in the range[-∏/2, ∏/2].

Example 1

Let's see a simple example when the value of x is zero.

#include 
#include
using namespace std;
int main()
{
    float degree=0;
    float x=degree*3.14/180;
    std::cout << "Value of tangent is :" <

Output:

Value of tangent is :0
Inverse of tangent is :0

In this example, atan() function calculates the inverse tangent of a number when the value of x is equal to zero.

Example 2

Let's see the simple example when the value of x is negative.

#include 
#include
using namespace std;
int main()
{
    float degree= -67;
    float x=degree*3.14/180;
    std::cout << "Value of tangent is : " <

Output:

Value of tangent is : -2.35197
Inverse of tangent is : -0.863063

In this example, atan() function calculates the inverse tangent of a number when the value of x is negative.

Example 3

Let's see a simple example when the value of x is positive.

#include 
#include
using namespace std;
int main()
{
    float degree=30;
    float x=degree*3.14/180;
    std::cout << "Value of tangent is : " <

Output:

Value of tangent is : 0.576996
Inverse of tangent is : 0.48214

In this example, atan() function calculates the inverse tangent of a number when the value of x is positive.


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