Control Structures

Control Structures

1. Sequential structures

   • It describes all the steps in a sequential order to be executed by a program.

2. Conditional structures

   • A condition in programing is a situation that can be evaluated as true or false.
     • Examples
       • IF-THEN: IF condition THEN sequence_of_statements END IF;
       • IF-THEN-ELSE: IF condition THEN sequence_of_statements1 ELSE sequence_of_statements2 END IF;
       • IF-THEN-ELSEIF: IF condition1 THEN sequence_of_statements1 ELSIF condition2 THEN sequence_of_statements2 ELSIF condition3 THEN sequence_of_statements3 ELSE sequence_of_statements4 END IF;

3. Cyclic sttructures

   • They repeat certain actions until a condition is met.
     • Examples
       • FOR structure. This structure allows to repeat the actions until a variable meets a condition for it to go out of the loop.
       • WHILE structure. This structure will execute the sentences in between the structure while the condition value is true.
       • DO WHILE structure. This structure is a variant of the WHILE loop. In this case, the sequence of sentences will be executed at least once until the condition is evaluated.

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