Quick Answer: What Are Two Forms Of A Selection Control?

What is a selection structure?

Also known as a conditional structure, a selection structure is a programming feature that performs different processes based on whether a boolean condition is true or false.

Selection structures use relational operators to test conditions..

What is case selection statement?

Advertisements. A Select Case statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each select case.

What is a case structure?

A Case Structure is a branching control mechanism that allows different executions depending on the value of the label. The Case Structure is analogous to the Case block in Java or C++ in which, based on what case value the input variable matched, the case structure will choose the correct cases for execution.

What is the difference between selection and iteration?

Iteration is when we use loops to repeat code in a program. Selection is when we use conditionals (if/else) to execute different blocks of code in a program.

What is a single alternative decision structure?

What is a single alternative decision structure? A decision structure that provides a single alternative path of execution. If the. condition that is being tested is true, the program takes the alternative path.

What are the three types of selection control structures?

Flow of control through any given function is implemented with three basic types of control structures:Sequential: default mode. … Selection: used for decisions, branching — choosing between 2 or more alternative paths. … Repetition: used for looping, i.e. repeating a piece of code multiple times in a row.

What are the different types of control structures in Python?

Flow of control through any given program is implemented with three basic types of control structures: Sequential, Selection and Repetition.Sequential. Sequential execution is when statements are executed one after another in order. … Selection. … Repetition.

What are the 3 iterative control structures?

Iterative Control: LOOP and EXIT Statements. LOOP statements let you execute a sequence of statements multiple times. There are three forms of LOOP statements: LOOP , WHILE-LOOP , and FOR-LOOP .

Which selection structure is used when we have multiple conditions to be evaluated?

A nested if statement is an if statement placed inside another if statement. Nested if statements are often used when you must test a combination of conditions before deciding on the proper action.

How many control structures are there?

threeThere are three fundamental control structures in structured programming.

Is while a selection statement?

if () … else statements and syntax While if performs an action only when its condition evaluate to true , if / else allows you to specify the different actions when the condition true and when the condition is false .

What is a selection control structure?

Selection Control Structure Definition The selection control structure permits the execution of one block of program statements if the condition is true. … The selection control structure performs different computations based on the result (true or false) that is obtained after checking a Boolean condition.

What statements are used when applying selection?

This is done by making use of selection statements. Selection statements allow a program to test several conditions, and execute instructions based on which condition is true. That is why selection statements are also referred to as conditional statements.

What is multi way selection?

A multi-way selection statement is used to execute at most ONE of the choices of a set of statements presented. Syntax of the multi-way select statement: switch ( EXPRESSION ) { case CONSTANT1: one or more statements; break; case CONSTANT2: one or more statements; break; … [

What is if selection statement?

“if” structure is single selection structure; it selects or ignores a single action; if the condition is true, the statement is executed; if the condition is false, the statement is skipped (indention is optional but improves readability of program)

What is selection in C++?

Selection Statements (C++) The C++ selection statements, if and switch, provide a means to conditionally execute sections of code. The __if_exists and __if_not_exists statements allow you to conditionally include code depending on the existence of a symbol. See the individual topics for the syntax for each statement.

How does a programmer determine whether a problem’s solution requires a selection structure?

T/F A programmer determines whether a problem’s solution requires a nested selection structure by studying the problem specification. … T/F A common error made when writing selection structures is to use a compound condition in the outer selection structure when a nested selection structure is needed.

What are the names of the two selection control structures?

Control Structures – Selection Selection: decisions, branching; When there are 2 or more alternatives. Three types: if. if…else.