C++ llround()

C++ llround() rounds given value to nearest long long int.

Syntax

The syntax of C++ llround() is

llround(x)

where

ParameterDescription
xA value of type float, double, long double, or integral type.

Returns

The function returns long long int value.

The synopsis of llround() function is

long long int llround(float x);
long long int llround(double x);
long long int llround(long double x);

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

Example

In this example, we

C++ Program

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

int main() {
    double x;
    cout << "Enter a number : ";
    cin >> x;
    
    double result = llround(x);
    cout << "llround(" << x << ") : " << result << endl;
}

Output

Enter a number : 25.3685
llround(25.3685) : 25
Program ended with exit code: 0
Enter a number : -2.36
llround(-2.36) : -2
Program ended with exit code: 0

Conclusion

In this C++ Tutorial, we learned the syntax of C++ llround(), and how to use this function to find the nearest long long int of given value, with the help of examples.