What Is Selection In Computer Science?

What is meant by selection in computer science?

Selection is a programming construct where a section of code is run only if a condition is met. In programming, there are occasions when a decision needs to be made. Selection is the process of making a decision. The result of the decision determines which path the program will take next.

What is an example of selection in computer science?

Sometimes you only want some lines of code to be run only if a condition is met, otherwise you want the computer to ignore these lines and jump over them. This is known as Selection and is achieved by using IF statements. Figure 2 is an example of selection.

What is sequence and selection?

Sequencing is the sequential execution of operations, selection is the decision to execute one operation versus another operation (like a fork in the road), and iteration is repeating the same operations a certain number of times or until something is true.

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What is meant by selection in Python?

In Python, the selection statements are also known as decision making statements or branching statements. The selection statements are used to select a part of the program to be executed based on a condition.

Why do we use selection in programming?

A selection is used to make choices depending on information. An algorithm can be made smarter by using IF, THEN, and ELSE functions to reiterate instructions, or to move the process in question to different parts of the program. Selection is also called a decision.

What is sequence in coding?

Sequences are the main logical structure of algorithms or programs. When creating algorithms or programs, the instructions are presented in a specific correct order. A sequence can contain any number of instructions but each instruction must be run in the order they are presented.

What is computer selection area?

Also called a decision, one of the three basic logic structures in computer programming. The other two logic structures are sequence and loop. In a selection structure, a question is asked, and depending on the answer, the program takes one of two courses of action, after which the program moves on to the next event.

What is algorithm selection?

Selection is a decision or question. At some point in an algorithm there may need to be a question because the algorithm has reached a step where one or more options are available. Depending on the answer given, the algorithm will follow certain steps and ignore others.

What does and mean in computer science?

Logical Operators

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Operator Description Example
&& Called Logical AND operator. If both the operands are non-zero, then condition becomes true. (A && B) is false.
|| Called Logical OR Operator. If any of the two operands is non-zero, then condition becomes true. (A || B) is true.

What are the 3 types of control structures?

The three basic types of control structures are sequential, selection and iteration. They can be combined in any way to solve a specified problem. Sequential is the default control structure, statements are executed line by line in the order in which they appear.

How many types of computer selection are there?

There are 2 types of selection that you need to learn for GCSE: IF.. THEN.. ELSE.. ENDIF.

Is an if statement selection?

The simplest form of selection is the if statement. This is sometimes referred to as binary selection since there are two possible paths of execution. The boolean expression after the if statement is called the condition. If it is true, then the immediately following indented statements get executed.

What does == mean in Python?

== is a comparison operator: returns True is the two items are equal, returns False if not, throws error if used to assign variable before definition and if the two items are not compatible. = is an assignment operator: will assign values like strings or numbers to variables.

How do you write if in python?

An ” if statement” is written by using the if keyword. Python supports the usual logical conditions from mathematics:

  1. Equals: a == b.
  2. Not Equals: a!= b.
  3. Less than: a < b.
  4. Less than or equal to: a <= b.
  5. Greater than: a > b.
  6. Greater than or equal to: a >= b.
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Is string immutable in Python?

In python, the string data types are immutable. Which means a string value cannot be updated. We can verify this by trying to update a part of the string which will led us to an error. We can further verify this by checking the memory location address of the position of the letters of the string.

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