There are three logical structure in a structure program. they are ______
1. The sequence structure
2. The loop structure and
3. The selection structure

Priming read means reading the first record in a file prior to entering a loop that is executed until EOF is detected.

A device for recording the number of times something occurs. In programming, counter technique requires that the number of data records to be read be known in advance.

Control field : A field is input records that is used to sequence the file and that is checked to determine  when a subtotal is to be printed.

Control break : A change in the value in a control field between consecutive resords in a file.

1. IF condition THEN 
      instruction-T
   END IF

2. IF condition THEN
    instruction-T
   ELSE
    instruction-F
   END IF

3. IF condition-A THEN
     instruction-1
   ELSE IF condition-B THEN 
     instruction-2
   ELSE IF condition-C THEN
     ...
   ELSE 
     instruction-n 
   END IF