C++ <cmath> - ceil() Function

The C++ <cmath> ceil() function returns the next highest integer value by rounding up the specified number, if necessary. In other words, it rounds the fraction UP of the given number.

Syntax

C++98
C++11

double ceil (double x);
float ceil (float x);
long double ceil (long double x);

double ceil (double x);
float ceil (float x);
long double ceil (long double x);
//additional overloads for integral types
double ceil (T x);

Parameters

`x`	Specify a number.

Return Value

Returns the next highest integer value by rounding UP the specified number, if necessary.

Example:

In the example below, ceil() function is used to round the fraction UP of the specified number.

#include <iostream>
#include <cmath>
using namespace std;
 
int main (){
  cout<<ceil(10.5)<<"\n";
  cout<<ceil(-10.5)<<"\n";
  cout<<ceil(0.5)<<"\n";
  cout<<ceil(-0.5)<<"\n";   
  return 0;
}

The output of the above code will be:

❮ C++ <cmath> Library