Simple Predefined functions in c++

Function Name	Header File	Return Value	Parameter type	Return Type
abs(x)	<cstdlib>	Returns the absolute value of its argument: abs (-7) = 7	int	int
ceil(x)	<cmath>	Returns the smallest whole number that is not less than x: ceil (56.44) = 57.0	double	double
cos(x)	<cmath>	Returns the cosine of angle x: cos(0.0) = 1.0	double	Double
exp(x)	<cmath>	Returns ex , where e=  2.71828 : exp(1.0) = 2.71828	double	double
fabs(x)	<cmath>	Returns the absolute value of its argument: fabs(-5.67) = 5.67	double	double
floor(x)	<cmath>	Returns the largest whole number that is not greater than x: floor(45.67) = 45.00	double	double
pow (x, y)	<cmath>	Returns xy : if x is negative, y must be a whole number : pow(0.16, 0.5) = 0.4	double	double