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Programming Articles
Page 2505 of 2547
What is 0 (zero) - A decimal literal or An octal literal in C++
The 0 (Zero) before a number is basically the octal literal.In C/C++ we can use octal literals by typing a zero before the actual number. For example, if an octal number is 25, then we have to write 025.Example Code#include int main() { int a = 025; int b = 063; printf("Decimal of 25(Octal) is %d", a); printf("Decimal of 63(Octal) is %d", b); }OutputDecimal of 25(Octal) is 21 Decimal of 63(Octal) is 51
Read MoreJava Program to parse a mathematical expression and operators
At first, we have set the mathematical expressions:String one = "10+15*20-5/5"; String two = "3+5-6"; String three = "9+2*(6-3+7)";To parse mathematical expression, use Nashorn JavaScript in Java i.e. scripting. Nashorn invoke dynamics feature, introduced in Java 7 to improve performance.For scripting, use the ScriptEngineManager class for the engine:ScriptEngineManager scriptEngineManager = new ScriptEngineManager(); ScriptEngine scriptEngine = scriptEngineManager.getEngineByName("Nashorn");Now for JavaScript code from string, use eval i.e. execute the script. Here, we are parsing mathematical expressions set above:Object expResult1 = scriptEngine.eval(one); Object expResult2 = scriptEngine.eval(two); Object expResult3 = scriptEngine.eval(three);Exampleimport javax.script.ScriptEngine; import javax.script.ScriptEngineManager; public class Demo { public static void main(String[] args) throws ...
Read MoreHow can I create custom tag in JSP which can accept attribute from parent jsp page?
You can use various attributes along with your custom tags. To accept an attribute value, a custom tag class needs to implement the setter methods, identical to the JavaBean setter methods as shown below −package com.tutorialspoint; import javax.servlet.jsp.tagext.*; import javax.servlet.jsp.*; import java.io.*; public class HelloTag extends SimpleTagSupport { private String message; public void setMessage(String msg) { this.message = msg; } StringWriter sw = new StringWriter(); public void doTag() throws JspException, IOException { if (message != null) { /* Use message from attribute ...
Read MoreWhat are the standard attributes that should be passed to a custom tag in a JSP page?
Consider including the following properties for an attribute −S.No.Property & Purpose1nameThe name element defines the name of an attribute. Each attribute name must be unique for a particular tag.2requiredThis specifies if this attribute is required or is an optional one. It would be false for optional.3rtexprvalueDeclares if a runtime expression value for a tag attribute is valid4typeDefines the Java class-type of this attribute. By default, it is assumed as String5descriptionInformational description can be provided.6fragmentDeclares if this attribute value should be treated as a JspFragment.Following is the example to specify properties related to an attribute −..... ...
Read MoreHow to pass check boxes data using JSP?
Checkboxes are used when more than one option is required to be selected.Following is an example HTML code, CheckBox.htm, for a form with two checkboxes. Maths Physics Chemistry The above code will generate the following result − Maths Physics Chemistry Following is main.jsp JSP program to handle the input given by the web browser for the checkbox button. Reading Checkbox Data Reading Checkbox Data Maths Flag: Physics Flag: Chemistry Flag: The above program will generate the following result −Reading Checkbox DataMaths Flag :: onPhysics Flag:: nullChemistry Flag:: on
Read MoreHow to listdown all the symbols in a .so file in C++
To read a .so file in elf format, use readelfreadelf -Ws libName.soIt helps to extract symbol from binary.The standard tool used for listing all symbol is, nmnm -g libName.so
Read MoreJava Program to adjust LocalDate to next Tuesday with TemporalAdjusters class
At first, set a LocalDate:LocalDate localDate = LocalDate.of(2019, Month.FEBRUARY, 2);Now, adjust the LocalDate to next Tuesday using next() method:LocalDate date = localDate.with(TemporalAdjusters.next(DayOfWeek.TUESDAY));Exampleimport java.time.DayOfWeek; import java.time.LocalDate; import java.time.Month; import java.time.temporal.TemporalAdjusters; public class Demo { public static void main(String[] args) { LocalDate localDate = LocalDate.of(2019, Month.FEBRUARY, 2); System.out.println("Current Date = "+localDate); System.out.println("Current Month = "+localDate.getMonth()); LocalDate date = localDate.with(TemporalAdjusters.firstDayOfMonth()); System.out.println("First day of month = "+date); date = localDate.with(TemporalAdjusters.next(DayOfWeek.TUESDAY)); System.out.println("Next Tuesday date = "+date); } }OutputCurrent Date = 2019-02-02 Current ...
Read MoreJava Program to convert Instant to LocalDateTime
Let’s say you need to convert Instant to LocalDateTime with IST with timezone:Create an Instant:Instant instant = new Date().toInstant();Now, convert Instant to LocalDateTime:LocalDateTime date = LocalDateTime.ofInstant(instant, ZoneId.of(ZoneId.SHORT_IDS.get("IST")));Exampleimport java.time.Instant; import java.time.LocalDateTime; import java.time.ZoneId; import java.util.Date; public class Demo { public static void main(String[] args) { Instant instant = new Date().toInstant(); LocalDateTime date = LocalDateTime.ofInstant(instant, ZoneId.of(ZoneId.SHORT_IDS.get("IST"))); System.out.println("Date (IST) = " + date); date = LocalDateTime.ofInstant(instant, ZoneId.of(ZoneId.SHORT_IDS.get("PST"))); System.out.println("Date (PST) = " + date); date = LocalDateTime.ofInstant(instant, ZoneId.of(ZoneId.SHORT_IDS.get("EST"))); System.out.println("Date (EST) = " ...
Read MoreHow to use a filter in JSP?
Following example shows how to print the client's IP address and the current date time, each time it would access any JSP file. This example will give you a basic understanding of the JSP Filter, but you can write more sophisticated filter applications using the same concept −// Import required java libraries import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; // Implements Filter class public class LogFilter implements Filter { public void init(FilterConfig config) throws ServletException { // Get init parameter String testParam = config.getInitParameter("test-param"); //Print the init parameter ...
Read MoreHow do you define multiple filters in JSP?
Your web application may define several different filters with a specific purpose. Consider, you define two filters AuthenFilter and LogFilter. Rest of the process will remain as explained above except you need to create a different mapping as mentioned below − LogFilter LogFilter test-param Initialization Paramter AuthenFilter AuthenFilter test-param Initialization Paramter LogFilter /* AuthenFilter /* Filters Application OrderThe order of filter-mapping elements ...
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