C++ ceil()

ceil() Syntax

The syntax of the ceil() function is:

ceil(double num);

ceil() Parameters

The ceil() function takes the following parameter:

• num - floating-point number whose ceiling value is to be computed

ceil() Return Value

The ceil() function returns:

• the smallest possible integer value which is greater than or equal to num

ceil() Prototypes

The prototypes for ceil() as defined in the cmath header file are:

double ceil(double num);

float ceil(float num);

long double ceil(long double num);

// for integral types
double ceil(T num);

Example 1: C++ ceil()

Output

Ceil of 10.25 = 11

Example 2: C++ ceil() for Integral Types

Output

Ceil of 15 = 15

We will always get the same result for integral types. So this function is not used with integral types in practice.