# round() function with example in C++

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

## C++ round() function

round() function is a library function of cmath header, it is used to round the given value that is nearest to the number with halfway cases rounded away from zero, it accepts a number and returns rounded value.

Syntax of round() function:

```    round(x);
```

Parameter(s): x – is the number to round nearest to zero with halfway cases.

Return value: double – it returns double type value that is the rounded value of the number x.

Example:

```    Input:
float x = 2.3;
Function call:
round(x);
Output:
2

Input:
float x = 2.8;
Function call:
round(x);
Output:
3
```

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

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

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

// main() section
int main()
{
float x;

x = 15.3;
cout<<"round("<<x<<"): "<<round(x)<<endl;

x = 15.5;
cout<<"round("<<x<<"): "<<round(x)<<endl;

x = 15.8;
cout<<"round("<<x<<"): "<<round(x)<<endl;

x = -15.3;
cout<<"round("<<x<<"): "<<round(x)<<endl;

x = -15.5;
cout<<"round("<<x<<"): "<<round(x)<<endl;

x = -15.8;
cout<<"round("<<x<<"): "<<round(x)<<endl;

return 0;
}
```

Output

```round(15.3): 15
round(15.5): 16
round(15.8): 16
round(-15.3): -15
round(-15.5): -16
round(-15.8): -16
```

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