C++ Math lrint() Function

C++ Math lrint() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math lrint()

The function rounds off the given value using current rounding mode and returns the value of type long int.

Syntax

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

long int lrint(data_type x);

Parameter

x: The value that can be float, double or long double.

Return value

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

Example 1

Let's see a simple example.

#include 
#include
#include 
using namespace std;
int main()
{
    float r;
    int str;
    cout<<"Enter the value which you want to round :";
    std::cin >> r ;
    cout<<'\n';
    cout<<"Name of the methods are :"<<'\n'<<"1. Rounding downwards"<<'\n'<<"2. Rounding upwards"<<'\n'<<"3. 
    Rounding towards zero"<<'\n'<<"4. Rounding to the nearest"<<'\n';
    cout<<"Enter the number of rounding method :";
    cin>>str;
    cout<<'\n';
    switch(str)
    {
        case 1:
        fesetround(FE_DOWNWARD);
        cout<<"Rounding downwards,value is :"<

Output:

Enter the value which you want to round : 7.8

Name of the methods are :
1. Rounding downwards
2. Rounding upwards
3. Rounding towards zero
4. Rounding to the nearest
Enter the number of rounding method : 1

Rounding downwards,value is :7

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