Web+ Tutorial

Lesson 1.6 - Using Arrays

Description

You can assign many variables with the same name, and distinguish between them by using index values. For example, you can have three different variables named a[1], a[2], and a[3]. A group of variables like this is called an array.

There are two ways you can set the values of array variables:

• You can set the value of one variable individually with a statement such as
  <webSet #a[2]# = 7>
• You can set multiple values at once with a statement like
  <webSet #a[]# = ",0,1,,3">

In the second statement, the first character of the string is the delimiter which separates different values. You can use any character as the delimiter. That statement will set values for a[0], a[1], ..., a[n] depending on how many values are contained in the string.

• You can also count the number of items inside an array like
  #ArrayCount(a[])#.

Syntax

<webSet #variable[index]# = expression>
<webSet #variable[]# = delim & value0 & delim & value1 & delim & ... & delim & valuen>
<webPrint> ...#variable[index]#... </webPrint>
#ArrayCount(Name of the array)#


Example

<webSet #a[0]# = 3>
<webSet #b[50]# = "Web+">
<webSet #c[]# = ",0,1,2,,,,,7">	sets c[0]=0, c[1]=1, c[2]=2, c[7]=7
<webSet #city[]# = "/Minneapolis, MN/Boston, Mass./San Francisco, CA">	city[0]="Minneapolis, MN", city[1]="Boston, Mass.", city[2]="San Francisco, CA"
#ArrayCount(city[])#

Sample

<webSet #x[]# = ",0,1,2,3,,5,6,,,20,30">
<webFOR #n# = 0 to 10>
    <webSet #y[n]# = #int (rnd (2) * 100)#>
</webFor>

<webFor #n# = 0 to 10>
    <webPrint>(#x[n]#, #y[n]#);</webPRINT>
</webFor>
<p>
Nbr. of items in array X: <webPrint>#ArrayCount(x[])#</webPrint>

Result:

Exercise

You can try out some Web+ code of your own here.