# floor() function with example in C++

C++ floor() function: Here, we are going to learn about the floor() function with example of cmath header in C++ programming language?
Submitted by IncludeHelp, on April 27, 2019

## C++ floor() function

floor() function is a library function of cmath header, it is used to find the roundup (downward) value of the given number, it accepts a number and returns largest integral value that is not greater than to the given number.

Syntax of floor() function:

```    floor(x);
```

Parameter(s): x – is the number whose value to round up.

Return value: double – it returns double type value that is the rounded up value of the given number.

Example:

```    Input:
float x = 2.3;
Function call:
floor(x);
Output:
2

Input:
float x = 3.8
Function call:
floor(x);
Output:
3
```

### C++ code to demonstrate the example of floor() function

```// C++ code to demonstrate the example of
// floor() function

#include <iostream>
#include <cmath>
using namespace std;

// main() section
int main()
{
float x;

//input the number
cout<<"Enter a float value: ";
cin>>x;

//printing the round up value
cout<<"floor("<<x<<"): "<<floor(x)<<endl;

return 0;
}
```

Output

```First run:
Enter a float value: 2.3
floor(2.3): 2

Second run:
Enter a float value: 3.8
floor(3.8): 3

Third run:
Enter a float value: -2.3
floor(-2.3): -3

Fourth run:
Enter a float value: -3.8
floor(-3.8): -4
```

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