for

Read(336) Label: for,

Here’s how to use for statement.

for a , b , s

Description:

Execute a loop according to the specified scope and step.

Syntax:

for  a,b,s

Note:

The statement executes the code block in loops from a to b with a step of s.

Parameters:

a

An integer

b

An integer

s

An integer to indicate the step. Its value is 1 by default.

Example:

 

A

B

 

1

 

 

Save the cumulative total -18 - in A1.

2

for 1,11,5

 

 

3

 

>A1=A1+A2

Add up integers within the scope from 1 to 11 with a step of 5, i.e. every 4 integers.

 

 

for cs , n ; x

Description:

Loop through a cursor.

Syntax:

for cs,n;x

Note:

The statement retrieves n records from the cursor and returns or retrieves records till x… has changed. Close the cursor once the retrieval is completed. This function is often used to fetch a large volume of records by group. Return all the remaining records and close the cursor when omitting n and x.

Parameters:

cs

Cursor

n

Number of records

x

Grouping expression, and cs is sorted by x. With x, n can be ignored.

Example:

 

A

B

 

1

=demo.cursor("select * from EMPLOYEE order by SALARY desc")

=[]

 

2

for A1,10;SALARY

 

 

3

 

>B1.insert(0,A2)

Loop through the cursor, selecting records with the same SALARY value and inserting them into B1.

for x

Description:

Start a loop.

Syntax:

for  x

Note:

The statement starts a loop executing the code block.

Parameter:

x

A sequence, an integer, or a logic expression. Loop through the code block against x or to(x), or if x is true. If x is empty, then the loop will be endless.

Example:

x is an integer:

 

A

B

 

1

 

 

Save the cumulative total 55 in A1

2

for 10

 

 

3

 

>A1=A1+A2

Add up the integers from 1 to 10

 

x is empty:

 

A

B

C

 

1

=0

 

 

5050

2

for

 

 

Loop will be endless if x is empty. When the loop count reaches 100, then break the loop

3

 

>A1=A1+#A2

 

 

4

 

if #A2==100

break

 

x is a boolean expression:

 

A

B

 

1

=15

 

 

2

for A1>10

 

If A1 >10, then start a loop through the code block; otherwise, quit the loop

3

 

>B1=B1+#A2

4

 

>A1=A1-1

 

 

x is a sequence:

 

A

B

 

1

=demo.query("select * from EMPLOYEE")

0

Get the oldest age among all Texas employees in B1 after the loop is over

2

=A1.select(STATE=="Texas")

 

 

3

for A2

=age(A3.BIRTHDAY)

A3 performs loop over each Texas employee while computing their age

4

 

>B1=max(B1,B3)

The oldest age is stored in B1