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.

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

Figure: Generalized selection structure