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Data in the Algorithms

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by

Amabel Perez

on 18 January 2013

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Transcript of Data in the Algorithms

Types of Variables Data in the Algorithms Identifiers Variables Constants Names we give to variables and
constants.Only use letters (A-Z),
numbers (0-9) and the underscore (-) Example: area, age, cost_1, cost_2, name Variables A named unit of storage that can be changed to any specified value during the execution of a program. Constants is an identifier whose value never changes during the execution of the program Example: pi=3.1416 Numeric Logic String This type of variable stores numerical values, positive or negative. Example: Temperature = -8, Cost_1=15655 This type of variables can contain only a value True or False as a result of a comparison This type of variable stores alphanumeric characters (letters, numbers, and special characters) Examples:
LastName = ’Hernandez’
Adress = ‘H. Colegio Militar 2108, Col. Roma’
City = ‘Chihuahua’ Internal use Variables Work Variables Counters Cumulatives store the result of a mathematical operation
Sum = a + b /c Add a cumulative sum of a set of values given progressively.
Sum = Sum + Grade To count the number of times a process will be performed, usually the increment goes 1 by 1 Times = Times + 1 Operators Arithmetic Comparison Logical Statements Conditional
Statements Are the elements that allow us manipulate the values in a expression or between variables and constants. Used to write mathematical operations using variables and constants They compare two values and return a True or False value They establish relationships between logical values. Not = Negation
And = Both
Or = Either one Example: (20<50) and (60>15) Evaluates a given condition, if the condition is true then performs a specific action, otherwise do something else Example:if (temp <= 15) then
weather = 'Cold'
else
weather = 'warm' Algorithm
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