In this C++ tutorial, you will learn how to round a given number to nearest integer value using round() function of cmath, with syntax and examples.

## C++ round()

C++ round() returns integer value nearest to given value. Half-way (0.5) cases are rounded to higher nearest integer.

## Syntax

The syntax of C++ round() is

`round(x)`

where

Returns

The return value depends on the type of value passed for parameter x. The return value of round(x) is

• double if x is double or IntegralType.
• float if x is float.
• long double if x is long double.

The synopsis of round() function is

```float roundf(float);
double round(double);
long double roundl(long double);```

round() is a function of cmath library. Include cmath library at the start of program, if using round() function.

## Example

In this example, we read a double value from user into variable x, and find the nearest integer to this value in x, using round().

C++ Program

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

int main() {
double x;
cout << "Enter a number : ";
cin >> x;

double result = round(x);
cout << "round(" << x << ") : " << result << endl;
}```

Output

```Enter a number : 3.14
round(3.14) : 3
Program ended with exit code: 0```
```Enter a number : 3.5
round(3.5) : 4
Program ended with exit code:```
```Enter a number : 3.62
round(3.62) : 4
Program ended with exit code: 0```

## Conclusion

In this C++ Tutorial, we learned the syntax of C++ round(), and how to use this function to round off given number to nearest integer value, with the help of examples.