# lround() function with example in C++

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

## C++ lround() function

lround() function is a library function of cmath header, it is used to round the given value and casts to a long integer, it accepts a number and returns the integer (long int) value that is nearest to the number (with halfway cases).

## Syntax

Syntax of lround() function:

```lround(x);
```

## Parameter(s)

x – is the number to round nearest to zero with halfway cases.

## Return value

long int – it returns long int type value that is the rounded value of the number x.

## Sample Input and Output

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

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

## Example

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

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

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

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

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

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

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

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

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

return 0;
}
```

### Output

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