Initializing help system before first use

# ceil

Purpose
Round a number to the next largest integer.
Synopsis
`function ceil(r:real):integer`
Argument

r | Real number to be rounded

Return value
Rounded value.
Example
In the following, i takes the value 6, j takes the value -6, and k takes the value 13:

    i := ceil(5.6)
    j := ceil(-6.7)
    k := ceil(12.3)

Further information
Although this function returns an integer, an implementation working on reals will be used when it is called in an expression over reals ( e.g. 1.0+ceil(x)). It is also possible to force this selection by casting the result of the operation ( e.g. real(ceil(x))): this can be necessary if the result is too large to be represented by an integer or if the function is used in isolation.
Related topics
floor, round.
Parent Topic Predefined functions and procedures

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