trunc(z)

The trunc function returns the integer part of z. The function removes the decimal part of z, i.e. rounds against zero. z may be any numeric expression that evaluates to a real number or a complex number. If z is a complex number, the function returns trunc(re(z))+trunc(im(z))i.

fract(z)

The fract function returns the fractional part of z. The function removes the integer part of z, i.e. fract(z) = z - trunc(z). z may be any numeric expression that evaluates to a real number or a complex number. If z is a complex number, the function returns fract(re(z))+fract(im(z))i.

ceil(z)

The ceil function finds the smallest integer not less than z. z may be any numeric expression that evaluates to a real number or a complex number. If z is a complex number, the function returns ceil(re(z))+ceil(im(z))i.

floor(z)

The floor function, which is also called the greatest integer function, gives the largest integer not greater than z. z may be any numeric expression that evaluates to a real number or a complex number. If z is a complex number, the function returns floor(re(z))+floor(im(z))i.

round(z,n)

The round function rounds z to the number of decimals given by n. z may be any numeric expression that evaluates to a real number or a complex number. If z is a complex number, the function returns round(re(z),n)+round(im(z),n)i. n may be any numeric expression that evaluates to an integer. If n<0, z is rounded to n places to the left of the decimal point.