November 2001
Intermediate to advanced
936 pages
68h 43m
English
Math.ceil( ) — round a number up
JavaScript 1.0; JScript 1.0; ECMAScript v1
Math.ceil(x)x
Any numeric value or expression.
The closest integer greater than or equal to
x.
Math.ceil( ) computes the ceiling
function -- i.e., it returns the closest integer value that is
greater than or equal to the function argument. Math.ceil( ) differs from Math.round( ) in that it
always rounds up, rather than rounding up or down to the closest
integer. Also note that Math.ceil( ) does not
round negative numbers to larger negative numbers; it rounds them up
toward zero.
a = Math.ceil(1.99); // Result is 2.0 b = Math.ceil(1.01); // Result is 2.0 c = Math.ceil(1.0); // Result is 1.0 d = Math.ceil(-1.99); // Result is -1.0