C++ floor()

The floor() function in C++ is used to round down a given floating-point number to its nearest integer less than or equal to the given number. It's declared in the <cmath> header file.

Syntax

The syntax for using the floor() function is as follows:

double floor(double x);

Here, x is the floating-point number that needs to be rounded down to its nearest integer.

Example

Let's consider an example to understand how the floor() function works.

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
   double x = 4.6;
   cout << "The floor of " << x << " is " << floor(x) << endl;

   x = 2.3;
   cout << "The floor of " << x << " is " << floor(x) << endl;

   x = -3.4;
   cout << "The floor of " << x << " is " << floor(x) << endl;

   return 0;
}

Output:

The floor of 4.6 is 4
The floor of 2.3 is 2
The floor of -3.4 is -4

In the above example, we've used the floor() function to round down the given floating-point numbers to their nearest integers. As we can see, the function returns the nearest integer less than or equal to the given number.

Conclusion

In conclusion, the floor() function is a useful function in C++ for rounding down floating-point numbers to their nearest integer. It's simple to use and comes in handy when dealing with mathematical operations that require integer values.