Pres4 Operadores y Condiciones 2012 JAVA

8/13/2019 Pres4 Operadores y Condiciones 2012 JAVA

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Curso: COIS 394Prof. J.Aponte,DBA


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Operadores Aritmticos

Operadores de Relacin

Operadores Lgicos

IfStatement I f-ElseStatement

Estudio de casos


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5 + 2 es 7 5 2 es 3

5 * 2 es 10

5 / 2 es 2.5

5 % 2 es 1


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Son los smbolos que nos ayudan a establecercomparaciones.(if statement) == igual a > mayor que

< menor que >= mayor o igual


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X Max

Z >= Y

Codigo == B N1 != N2

X < (min + max)

(max + min) > X


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Nos permite establecer relacionescompuestas (if statement)

! (Not) && (and)

|| (or)


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(A > B) || (C == 5) (A > B) && (C == 5)

(A > B) || (C == 5) && (D < E)

!(A < B) && (C == 3)


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taxRate is over 25% and income is less than20000temperature is less than or equal to 75 orhumidity is less than 70%

age is over 21 and age is less than 60age is 21 or 22


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(taxRate > .25) && (income < 20000)

(temperature 21) && (age < 60)(age == 21) || (age == 22)


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Existen dos( 2) tipos de estructuras de

control para las condiciones:Seleccin (Selection/branching)Repeticin (Repetition(looping))


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Selectionifif elseswitch/case

Repetitionfor loopwhile loop


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donde se realiza o no los statements(puede ser una instruccin simple o un bloque

entero)

TRUE

FALSEStatement(s)

expression


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if (ExpressionStatement;

Ejemplo:

1. if (a > 5) b=a + c;

System.out.println(Saludos);


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if ( z == 8){

v=5;

System.out.println(POSITIVO);

j=A;}


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if (ExpressionStatementA;

elseStatementB;


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entre la ejecucin de una de dos clausuras (la delif clause o la del else clause)

TRUE FALSE

if clause else clause

expression


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if (Expression{

statementsA;}else{

statementsB;}

if clause

else clause


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Ejemplo:import java.io.*;

public class TercerPrograma{

public static void main(String[]args) throws IOException{int carDoors, driverAge;double premium, monthlyPayment;//Realizar proceso interactivo para las variablesSystem.out.print()if ((carDoors== 4) && (driverAge > 24))

{ premium = 650.00 ;System.out.print LOW RISK);}else {premium = 1200.00 ;System.out.print HIGH RISK);}

monthlyPayment = premium / 12.0 + 5.00 ;System.out.print(monthlyPayment );}}


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if (purchase > 100.00){ discountRate = 0.25 ;shipCost = 10.00;}else { discountRate = 0.15 ;

shipCost = 5.00;}totalBill = purchase * (1.0 - discountRate) + shipCost;


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1. If taxCode isT, increase price by addingtaxRate times price to it.

2. If code has value 1, read values for incomeand taxRate from keyboard, and calculateand display taxDue as their product.


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1. if (taxCode == Tprice = price+taxRate price;

2. if (code = = 1){// realizar proceso interactivo para las variables

taxDue = income * taxRate;System.out.print(TaxDue);

}


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is also called multi-way branching,andcan be accomplished by using NESTED ifstatements.


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if (Expression1 )Statement1;

else if ( Expression2 )Statement2;

else if ( ExpressionN )StatementN;elseStatementN+1;

EXACTLY 1 of these statements will be executed.


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Each Expression is evaluated in sequence, untilsome Expression is found that is true.Only the specific Statement following that

particular true Expression is executed.If no Expression is true, the Statement followingthe final else is executed.

AN EXAMPLE . . .


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if (creditsEarned >=90)System.out.print SENIOR STATUS);

elseif (creditsEarned >=60)System.out.print JUNIOR STATUS);

elseif (creditsEarned >=30)System.out.print SOPHOMORE STATUS);

elseSystem.out.print FRESHMAN STATUS);


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1. Display one word to describe the intvalue of number as Positive, Negative,or Zero.2. Your city classifies a pollution indexless than 35 as Pleasant,35 through 60 as Unpleasant,

and above 60 as Health Hazard.Display the correct description of thepollution index value.


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if (index < 35)

System.out.print(Pleasant);elseif (index

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Pres4 Operadores y Condiciones 2012 JAVA