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tan() function with example in C++

C++ tan() function: Here, we are going to learn about the tan() function with example of cmath header in C++ programming language?
Submitted by IncludeHelp, on April 27, 2019

C++ tan() function

tan() function is a library function of cmath header, it is used to find the tangent of the given number (angle), it accepts a number (x) and returns the tangent of angle x radians.

Syntax of tan() function:


Parameter(s): x – is the value of an angle in radians whose tangent to be calculated.

Return value: double – it returns double type value that is the tangent of given angle x radians.


    float x = 2.45;
    Function call:

C++ code to demonstrate the example of tan() function

// C++ code to demonstrate the example of 
// tan() function

#include <iostream>
#include <cmath>
using namespace std;

// main() section
int main()
    float x;
    x = -10.23;
    cout<<"tan("<<x<<"): "<<tan(x)<<endl;

    x = 0;
    cout<<"tan("<<x<<"): "<<tan(x)<<endl;    

    x = 2.45;
    cout<<"tan("<<x<<"): "<<tan(x)<<endl;    
    return 0;


tan(-10.23): -1.04045
tan(0): 0
tan(2.45): -0.828017

Reference: C++ tan() function

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