Floor and Ceil Functions in C++

In programming dealing with integer values is more manageable and straightforward than decimal values. Working with integer values is easy and helps get accurate results. In c++, we have the floor and ceil functions to solve this problem. Floor and Ceil in c++ are those functions that help provide the integer value nearest to that decimal value. 

In this blog, we will learn about floor and Ceil in C++. Also see, Literals in C.

What is floor() in C++?

The floor is a function in c++ that is defined and described in the cmath header file.

• This function returns the largest possible integer that is equal to or smaller than the input number.
   
• It gives the downward value of the number.
   
• The floor() function takes a single input parameter and returns a single value integer. 

floor() syntax in C++

The syntax is similar to a normal function. 

floor(number);

The parameters of floor() function takes are shown below:

1. int floor(int number);
    
2. float floor(float number);
    
3. double floor(double number);
    
4. long double floor( long double number);
    

Return value

floor() returns the largest possible integer equal to or smaller than the input number. 

Examples of floor()

• Input: 10.25     Output: 10
   
• Input: 111.89   Output: 111
   
• Input: -2.6       Output: -3
   

Program using floor() function

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
float num= 11.66;
float var = -3.6;
cout<<"floor value of the num is "<<floor(num)<<endl;
cout<<"floor value of the var is "<<floor(var)<<endl;
return 0;
}

Output

What is ceil() in C++?

 Ceil is a function in c++ that is defined and described in the cmath header file.

• This function returns the smallest possible integer that is greater than or equal to the input number.
   
• It gives the upward value of the number.
   
• The ceil() function takes a single input parameter and returns a single value integer. 

ceil() syntax in C++

ceil(number);

The parameters this function takes are shown below:

1. int ceil(int number);
    
2. float ceil(float number);
    
3. double ceil(double number);
    
4. long double ceil( long double number);
    

Return value

ceil() returns the smallest possible integer that is equal to or smaller than the input number. 

Examples of ceil()

• Input: 10.5     Output: 11
   
• Input: 111.8   Output: 112
   
• Input: 3.7       Output: 4
   

Program using ceil() function

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
float num= 11.66;
float var = -3.6;
cout<<" Ceil value of the num is "<<ceil(num)<<endl;
cout<<" Ceil value of the var is "<<ceil(var)<<endl;
return 0;
}

Output

You practice by yourself with the help of online c++ compiler.

Must Read Swap Two Numbers Without Using Third Variable