C++ ceil() Function: Round Up Numbers

The ceil function in C++ is a mathematical function that returns the smallest integer greater than or equal to a given floating-point number.

The ceil function rounds up a floating-point number. When the given number is positive, ceil will return the smallest integer not less than the given number. When the given number is negative, ceil will return the largest integer not greater than the negative number.

For example, the ceil function will return 3 for the floating point number 2.3, and -2 for the floating point number -2.3.

The prototype of the ceil function is as follows:

double ceil(double x);

Parameter x is a floating-point number to be rounded, and the return value is a double precision floating-point number representing the smallest integer not less than x.