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cos() function with example in C++

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

C++ cos() function

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


Syntax of cos() function:



x – is the value of an angle in radians whose cosine to be calculated.

Return value

double – it returns double type value that is the cosine of given angle x radians.

Sample Input and Output

float x = 2.45;
Function call:


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

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

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

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

    x = 2.45;
    cout<<"cos("<<x<<"): "<<cos(x)<<endl;    

    return 0;


cos(-10.23): -0.692952
cos(0): 1
cos(2.45): -0.770231

Reference: C++ cos() function

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