C++ cmath rint() Function
Example
Round numbers to an integer:
cout << rint(2.7) << "\n";
cout << rint(2.5) << "\n";
cout << rint(3.5);Definition and Usage
The rint() function rounds a number to an integer, and returns it as a double.
It uses the current rounding mode (a setting that decides how numbers are rounded). By default, numbers are rounded to the nearest integer, and halfway cases are rounded to the nearest even integer. So 2.5 becomes 2, and 3.5 becomes 4. This is different from round(), which rounds 2.5 to 3.
The rint function is defined in the <cmath> header file.
Tip: nearbyint() gives the same result. Use lrint() or llrint() to get the result as a long or a long long.
Syntax
rint(double x)The function also works with float and long double values. Then it returns a value of the same type.
Parameter Values
| Parameter | Description |
|---|---|
| x | Required. The number to round. |
Technical Details
| Returns: | A double value with the rounded number. |
|---|
Related Pages
Read more about math in our Math Tutorial.
