# 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:

```    cos(x);
```

Parameter(s): 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.

Example:

```    Input:
float x = 2.45;

Function call:
cos(x);

Output:
-0.770231
```

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

```// 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;
}
```

Output

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

Reference: C++ cos() function

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