# The usefulness of selection and repetition

The following sections contain more details about combinations. Binomial coefficients and binomial expansions The binomial coefficient is so called because it appears in the binomial expansion:

They can be combined in any way necessary to deal with a given problem. Figure Control Structures The selection structure tests a condition, then executes one sequence of statements instead of another, depending on whether the condition is true or false. The iteration structure executes a sequence of statements repeatedly as long as a condition holds true.

The sequence structure simply executes a sequence of statements in the order in which they occur. IF Statements Often, it is necessary to take alternative actions depending on circumstances.

The IF statement lets you execute a sequence of statements conditionally. That is, whether the sequence is executed or not depends on the value of a condition. There are three forms of IF statements: If the condition is false or null, the IF statement does nothing.

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In either case, control passes to the next statement. Thus, the ELSE clause ensures that a sequence of statements is executed. That is, IF statements can be nested, as the following example shows: Conditions are evaluated one by one from top to bottom. If any condition is true, its associated sequence of statements is executed and control passes to the next statement.

If all conditions are false or null, the sequence in the ELSE clause is executed. Consider the following example: Nevertheless, bonus is assigned the proper value of because the second condition is never tested.

## PowerPoint Slideshow about 'From Selection to Repetition' - teresa

Guidelines Avoid clumsy IF statements like those in the following example: First, the value of a Boolean expression can be assigned directly to a Boolean variable. So, you can replace the first IF statement with a simple assignment, as follows: So, you can simplify the condition in the second IF statement, as follows: That way, your code will be easier to read and understand.

Compare the following IF statements:repetition is the ability to do something over and over again with repetition in the mix, we can solve practically any problem that can be solved with a computer repetition leverages the most famous Program Control -.

We investigate what we term the Repetition-Break plot structure: the use of repetition among obviously similar items to establish a pattern, and then a final contrasting item that breaks with the pattern to generate surprise. The Repetition Control Structure The repetition control structure is also known as the looping or iteration control structure.

Looping is the process of repeatedly executing one or more steps of an algorithm or program; it is essential in programming, as most programs perform repetitious tasks.

Support your answer with a hypothetical real-world example that uses one of the following selection control structures: a. simple selection b. simple selection with null false branch c. combined selection d.

nested selection 2. Explain how repetition control structures increase the usefulness and power of a computer program. Figure Control Structures The selection structure tests a condition, then executes one sequence of statements instead of another, depending on whether the condition is true or false.

A condition is any variable or expression that returns a Boolean value (TRUE or FALSE). N-S charts are graphical representation of program constructs that ensures program designers use the constructs that are available to them in the chosen high-level language.

Structured English is non-graphical methods that also ensures that a program designer uses the constructs that are available within the high-level language.

 Sentence Repetition Testing - SurveyWiki How do you use the three basic control structuresâ€”sequential, repetition, and selection? Lab program The Repetition Control Structure a.
What is repetition and control structure