Overview of control structures

According to the structure theorem, any computer program can be written by using the basic control structures as shown in figure below. They can be combined in any way but is necessary to deal with the given problem.

 

 

 

                                                       Figure: Control Structures


The selection structure tests the condition, and then executes one sequence of statements as an alternative of another, depending on whether the condition is true or false. The condition is any variable or expression that returns a Boolean value (TRUE or FALSE). The iteration structure executes a series of statements repetitively as long as a condition holds true. The sequence of structure simply executes a sequence of the statements in the order in which they occur.

Posted Date: 10/3/2012 5:39:50 AM | Location : United States

Ask an Expert

Related Discussions:- Overview of control structures-comparison operators, Assignment Help, Ask Question on Overview of control structures-comparison operators, Get Answer, Expert's Help, Overview of control structures-comparison operators Discussions

Write discussion on Overview of control structures-comparison operators
Your posts are moderated

Write your message here..

Related Questions

Parameter and keyword description - packages, Parameter and Keyword Descrip... Parameter and Keyword Description: package_name: This construct identifies the package. AUTHID Clause: This determine whether all the packaged subprograms impleme

Redeclaring predefined exceptions - user-defined exceptions, Redeclaring Pr... Redeclaring Predefined Exceptions Keep in mind that, the PL/SQL declares predefined exceptions globally in the package STANDARD; Therefore you need not declare them yourself.

Comparison operators- pl/sql, Comparison Operators The Comparison operat... Comparison Operators The Comparison operators can compare one expression to another. The outcome is always true, false, or null. Usually, you use a comparison operators in condi

Procedural constraint enforcement (triggers) , Procedural Constraint Enforc... Procedural Constraint Enforcement (Triggers) SQL has an alternative method of addressing database integrity, involving event-driven procedural code. The special procedures th

Relational operators and logical operators, Relational Operators and Logica... Relational Operators and Logical Operators It prepares the ground for subsequent sections in which each specific relational operator is paired with its logical counterpart, su

Using exception_init - user-defined exceptions, Using EXCEPTION_INIT T... Using EXCEPTION_INIT To handle unnamed internal exceptions, you should use the OTHERS handler or the pragma EXCEPTION_INIT. The pragma is a compiler directive that can be th

Sql script to create and populate the tables, Create the four tables and po... Create the four tables and populate them with the given data. Answer the following queries in SQL. 1. Get all part-color/part-city combinations. Note: Here and subsequently, the

Exit-when - iterative control, EXIT-WHEN The EXIT-WHEN statement permits... EXIT-WHEN The EXIT-WHEN statement permits a loop to complete conditionally. Whenever the EXIT statement is encountered, the condition in the WHEN clause is computed. When the co

Count operator in sql, Count Operator in SQL Example: Counting the stu... Count Operator in SQL Example: Counting the students who have scored more than 50 in some exam (SELECT COUNT (*) FROM (SELECT DISTINCT StudentId FROM EXAM_MARK WHE

Keys in sql, Keys in SQL SQL support for keys in the following respect... Keys in SQL SQL support for keys in the following respects: SQL does not require at least one key for every base table. If no key is explicitly declared, then KEY {ALL B