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C++ Math rint()

The function rounds off the given value to the nearest integer using current rounding mode. The current rounding mode is determined by fesetround().

For example:

rint(7.9) = 8;
if, fesetround(FE_DOWNWARD) then,
rint(7.9) = 7;

Syntax

Suppose a number 'x'. Syntax would be:

Note: The return_type can be float, double or long double.

Parameter

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

Return value

It returns the rounded value of x.

Example 1

Let's see a simple example.

#include <iostream>
#include<math.h>
#include <cfenv>
using namespace std;
int main()
{
    float x=9.9;
    std::cout << "Value of x is :" <<x<< std::endl;
    std::cout << "Rounding to nearest,value is :" <<rint(x)<< std::endl;
   fesetround(FE_UPWARD);
    std::cout << "Rounding to upward,value is :" <<rint(x)<< std::endl;
    fesetround(FE_DOWNWARD);
    std::cout << "Rounding to downward,value is :" <<rint(x)<< std::endl;
    return 0;
}

Output:

Value of x is :9.9
Rounding to nearest,value is :10
Rounding to upward,value is :10
Rounding to downward,value is :9

Next TopicC++ Math Functions

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