In this C++ tutorial, you will learn how to find the floor value of given decimal number using floor() function of cmath, with syntax and examples.
C++ floor()
C++ floor() returns floor value of given decimal number.
Floor value is the largest integer value less than the given number.
Syntax
The syntax of C++ floor() is
floor(x)
where
| Parameter | Description |
|---|---|
| x | A double, float, long double, or any integral type value. |
Returns
The return value depends on the type of value passed for parameter x.
The return value of floor(x) is
- double if x is double.
- float if x is float.
- long double if x is long double.
The synopsis of floor() function is
double floor(double x); float floor(float x); long double floor(long double x); double floor(T x); // For integral type
floor() is a function of cmath library. Include cmath library in the program, if using floor() function.
Example
In this example, we read a double value from user into x, and find its floor value using floor() function.
C++ Program
#include <iostream>
#include<cmath>
using namespace std;
int main() {
double x;
cout << "Enter a number : ";
cin >> x;
double result = floor(x);
cout << "floor(" << x << ") : " << result << endl;
} Output
Enter a number : 3.14 floor(3.14) : 3 Program ended with exit code: 0
Enter a number : 3.89 floor(3.89) : 3 Program ended with exit code: 0
Enter a number : 3 floor(3) : 3 Program ended with exit code: 0
Conclusion
In this C++ Tutorial, we learned the syntax of C++ floor(), and how to use this function to find the floor value of given number, with the help of examples.