nearbyint() function in C++

Syntax

return_type nearbyint(data_type x);  

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Let's have a look over the implementation of the nearbyint() function.

Example

The following example briefs an overview about the implementation of the nearbyint() function.

double nearbyint(double x);
long double nearbyint(long double x);
float nearbyint(float x);

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Parameter

This method has only one parameter, x, denoting the value to be rounded off.

Return Value

The function returns the rounded value of the parameterized number. To alter the return result of this method, we can utilise the fesetround() function.

It's time to learn more about the nearbyint() function by looking at several examples.

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Examples

Input

nearbyint(2.73);

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Output

3

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Input

nearbyint(12.23);

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Output

12

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Example 1

Consider the following code snippet :

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
  float f1 = 4.8;
  double d1 = 3.3;
  long double l1 = -8.9;
  cout << "Number 1 = " <<f1 << endl;
  cout << "Near by integer("<<f1<<") = " << nearbyint(f1) << endl;
  cout << "Number 2 = " <<d1 << endl;
  cout << "Near by integer("<<d1<<") = " << nearbyint(d1) << endl;
  cout << "Number 3 = " <<l1 << endl;
  cout << "Near by integer("<<l1<<") = " << nearbyint(l1) << endl;
  return 0;
}

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Output:

Number 1 = 4.8
Near by integer(4.8) = 5
Number 2 = 3.3
Near by integer(3.3) = 3
Number 3 = -8.9
Near by integer(-8.9) = -9

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Explanation :

The nearbyint() function rounds all input values to the nearest integer.

Example 2

Consider the following code snippet :

#include <iostream>
#include <cmath>
#include <cfenv>
using namespace std;
int main()
{
  float f1 = 4.8;
  double d1 = 3.3;
  long double l1 = -8.9;
  fesetround(FE_UPWARD);
  cout << "Number 1 = " <<f1 << endl;
  cout << "Near by integer("<<f1<<") = " << nearbyint(f1) << endl;
  cout << "Number 2 = " <<d1 << endl;
  cout << "Near by integer("<<d1<<") = " << nearbyint(d1) << endl;
  cout << "Number 3 = " <<l1 << endl;
  cout << "Near by integer("<<l1<<") = " << nearbyint(l1) << endl;
  return 0;
}

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Output:

Number 1 = 4.8
Near by integer(4.8) = 5
Number 2 = 3.3
Near by integer(3.3) = 4
Number 3 = -8.9
Near by integer(-8.9) = -8

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Explanation:

In the above code, to change the rounding mode to upward, we utilised the fesetround() function. The nearbyint() function returns the nearest upward value in this case. fesetround(FE_UPWARD) returns the nearest upward value.

Example 3

Consider the following code snippet :

#include <iostream>
#include <cmath>
#include <cfenv>
using namespace std;
int main()
{
  float f1 = 4.8;
  double d1 = 3.3;
  long double l1 = -8.9;
  fesetround(FE_DOWNWARD);
  cout << "Number 1 = " <<f1 << endl;
  cout << "Near by integer("<<f1<<") = " << nearbyint(f1) << endl;
  cout << "Number 2 = " <<d1 << endl;
  cout << "Near by integer("<<d1<<") = " << nearbyint(d1) << endl;
  cout << "Number 3 = " <<l1 << endl;
  cout << "Near by integer("<<l1<<") = " << nearbyint(l1) << endl;
  return 0;
}

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Output:

Number 1 = 4.8
Near by integer(4.8) = 4
Number 2 = 3.3
Near by integer(3.3) = 3
Number 3 = -8.9
Near by integer(-8.9) = -9

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Explanation:

In the above code, to change the rounding mode to downward, we utilised the fesetround() function. The nearbyint() function returns the nearest downward value in this case. fesetround(FE_DOWNWARD) returns the nearest downward value.

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Frequently Asked Questions

What is the Standard Template Library?

The Standard Template Library is a set of template classes written in C++. that provide common data structures and functions, including lists, stacks, and arrays.

What function rounds off the input to get the closest integral value?

The fegetround() rounds off the input to get the closest integral value.

In which header file the nearbyint() function is defined?

The <cmath> header file defines the quick_exit() function.

What is the return value of the nearbyint() function?

The nearbyint() returns the rounded value of the parameterized number.

Conclusion

In this article, we have extensively discussed the nearbyint() function in C++. The article explains the details of the nearbyint() function in C++.
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