Description:
Repeats a group of statements a specified number of times.
Syntax:
for (statement1; statement2; statement3)
{
[statements]
[break;]
}
The
for statement consists of three parts separated by semicolon:
statement1 - It defines the initial numeric value of the variable used as cycle counter. For example:
statement2 - Logical expression that is evaluated ata the beginning of each cycle iteration. If the expression returns
true, then the iteration is completed, otherwise the cycle is exited.
It is usualy a simpe test whether the cycle counter is within the defined range.
For example:
i < 20
statement3 - This statement is executed at the end of each iteration. It is usualy an incrementation (or decrementation) of corresponding cycle variable. For example:
i++
Note:
Tip: Change of the
i value inside the cycle may render the script hard to read and tune.
break statement can only be used within a
switch or
for control structure to provide an alternate way to exit. Any number of
break statements may be placed anywhere in the loop.
For similar purpose in the
VBScript language is used the statement
For...Next.
Example1:
A simple cycle example. It dumps text
i=1 and
i=2 into the
Debug_info item of the INFO system.
{
}
Example2:
You can nest For...Next loops by placing one For...Next loop within another. Give each loop a unique variable name as its counter. The following construction is correct:
{
{
{
Pm.Debug("i=" + i + ", j=" + j + ", k=" + k); }
}
}