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The Rnd function returns a random number. The number is always
less than 1 but greater or equal to 0. However, the Rnd Function
returns a random number less than one. So, in order to get a whole
number, you need to use the Int function. If you need a larger range
than 0 or 1, you need to multiply the result. Rnd is any valid
numeric expression. For any given initial seed, the same number
sequence is generated because each successive call to the Rnd function
uses the previous number as a seed for the next number in the sequence.
The Rnd function generates a pseudo-random number greater than
or equal to 0.0 and less than 1.0. The Number argument is optional,
but different numbers will give different pseudo-random numbers.
To produce random integers in a given range, use this formula
:-
Int((upperbound - lowerbound + 1) * Rnd + lowerbound)
The Syntax of the Rnd function is :-
The value of number determines how Rnd generates a random number:-
| If number is |
Rnd generates |
| Less than zero |
The same number every time, using number as the
seed. |
| Greater than zero |
The next random number in the sequence. |
| Equal to zero |
The most recently generated number. |
| Not supplied |
THe next random number in the sequence. |
Example#1 :-
Code :-
<%
document.write(Rnd)
%>
Output :-
0.7055475 |
Example#2 :-
Code :-
'If you refresh the page,
'using the code in example 1,
'the SAME random number will show over and over.
'Use the Randomize statement generate a new random number'
each time the page is reloaded!
Randomize
document.write(Rnd)
Output :-
0.4758112 |
Example#3 :-
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Code :-
'Here is how to produce random integers in a
'given range:
dim max,min
max=100
min=1
document.write(Int((max-min+1)*Rnd+min))
Output :-
71
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It can be better explained in the following ways :-
Example#4 :-
Code :-
<%
=Rnd()
%>
Output :-
0.7055475
|
Example#5 :-
Code :-
<%
=Rnd(127.89)
%>
Output :-
0.533424
|
Example#6 :-
Code :-
<%
=Rnd(-127.89)
%>
Output :-
0.6953956 |
Example#7 :-
Code :-
<%
Randomize %>
<% =Rnd()
%>
Output :-
0.1414095
|
Example#8 :-
The following code will generate a random number between any limits
you choose. (Since the Int function always rounds down, we add one
to the difference between the limits.)
Code :-
<% upperlimit = 50000.0 %>
<% lowerlimit = -30000.0 %>
<% =Int((upperlimit - lowerlimit + 1)*Rnd() + lowerlimit)
%>
Output :-
30366
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Note :- To repeat sequences of random numbers, call the
Rnd function with a negative argument immediately before using the
Randomize statement with a numeric arguments. Using the Randomize
statement with the same value for number does not repeat the previous
sequence.
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