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# rint() Function with Example in C++

C++ rint() function: Here, we are going to learn about the rint() function with example of cmath header in C++ programming language.
Submitted by IncludeHelp, on May 25, 2020

## C++ rint() function

rint() function is a library function of cmath header. It is used to round the given value to an integral value based on the specified direction by fegetround() function. It accepts a parameter and returns the rounded value.

Syntax of rint() function:

C++11:

```     double rint (double x);
float rint (float x);
long double rint (long double x);
double rint (T x);
```

Parameter(s):

• x – represents the value to round.

Return value:

It returns rounded (to an integral value) value.

Example:

```    Input:
double x = 123.4;

Function call:
rint(x);

Output:
123

Input:
double x = 123.5;

Function call:
rint(x);

Output:
124
```

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

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

#include <iostream>
#include <cmath>
#include <fenv.h> // for fegetround()
using namespace std;

int main()
{
double x = 0.0;

cout << "Specified rounding is: ";
switch (fegetround()) {
case FE_DOWNWARD:
cout << "Downward" << endl;
break;
case FE_TONEAREST:
cout << "To-nearest" << endl;
break;
case FE_TOWARDZERO:
cout << "Toward-zero" << endl;
break;
case FE_UPWARD:
cout << "Upward" << endl;
break;
default:
cout << "Unknown" << endl;
}

x = 123.4;
cout << "rint(" << x << "): " << rint(x) << endl;

x = 123.5;
cout << "rint(" << x << "): " << rint(x) << endl;

x = 123.6;
cout << "rint(" << x << "): " << rint(x) << endl;

x = -123.4;
cout << "rint(" << x << "): " << rint(x) << endl;

x = -123.5;
cout << "rint(" << x << "): " << rint(x) << endl;

x = -123.6;
cout << "rint(" << x << "): " << rint(x) << endl;

return 0;
}
```

Output

```Specified rounding is: To-nearest
rint(123.4): 123
rint(123.5): 124
rint(123.6): 124
rint(-123.4): -123
rint(-123.5): -124
rint(-123.6): -124
```

Reference: C++ rint() function

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