C++ Math lround()

This function is used to round off the given value and cast to long integer.

Syntax

Suppose a number is 'x'. Syntax would be:

Parameter

x: The value which can be either float or double.

Return value

It returns the rounded value of x. The return type of the function is long int.

Example 1

Let's see a simple example of using lround() function

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float x=2.3;
    double y=-12.6;
    float z=23.6;
    std::cout << "The value of x is : " <<x<< std::endl;
    std::cout << "The value of y is : " <<y<< std::endl;
    std::cout << "The value of z is : " <<z<< std::endl;
    cout<<"Rounded value of x is : "<<lround(x)<< std::endl;
    cout<<"Rounded value of y is : "<<lround(y)<< std::endl;
    cout<<"Rounded value of z is : "<<lround(z)<< std::endl;
    return 0;
}

Output:

The value of x is : 2.3
The value of y is : -12.6
The value of z is : 23.6
Rounded value of x is : 2
Rounded value of y is : -13
Rounded value of z is : 24

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