Programming Articles - Page 2668 of 3366

In this section, we will see what are the setjump and longjump in C. The setjump() and longjump() is located at setjmp.h library. The syntax of these two functions is like below.setjump(jmp_buf buf) : uses buf to store current position and returns 0. longjump(jmp_buf buf, i) : Go back to place pointed by buf and return i.These are used in C for exception handling. The setjump() can be used as try block, and longjump() can be used as throw statement. The longjump() transfers control the pointe which is pointed by setjump().Here we will see how to print a number 100 ... Read More

Here we will see how to calculate the time taken by the process. For this problem, we will use the clock() function. The clock() is present in the time.h header file.To get the elapsed time, we can get the time using clock() at the beginning, and at the end of the tasks, then subtract the values to get the differences. After that, we will divide the difference by CLOCK_PER_SEC (Number of clock ticks per second) to get the processor time.Example#include #include void take_enter() {    printf("Press enter to stop the counter ");    while(1) {       ... Read More

Here we will see how to change the output of the printf() function from main(). Here we will define a function that will change all of the printf() statements with the given type to another type.We will use the #define macro to do this task. This macro will be defined inside the function. We can directly put the #define line without using it in the function, but in that case always the printf() will be changed. To control it using main, we have to call the function first.Example#include void changePrintf() { //always any printf will print 50    #define ... Read More

Here we will see how to write one-line C function, that can round floating point numbers. To solve this problem, we have to follow these steps.Take the numberif the number is positive, then add 0.5Otherwise, subtract 0.5Convert the floating point value to an integer using typecastingExample#include    int my_round(float number) {    return (int) (number < 0 ? number - 0.5 : number + 0.5); } int main () {    printf("Rounding of (2.48): %d", my_round(2.48));    printf("Rounding of (-5.79): %d",my_round(-5.79)); }OutputRounding of (2.48): 2 Rounding of (-5.79): -6

Yes, we can do that using removeArrow() method.The following is an example to disable JComboBox arrow button:Exampleimport java.awt.Component; import java.awt.Container; import javax.swing.*; public class SwingDemo {    public static void main(String[] args) {       String[] strValues = {"One", "Two"};       JComboBox comboBox = new JComboBox(strValues);       removeArrow(comboBox);       JOptionPane.showMessageDialog(null, comboBox);    }    private static void removeArrow(Container container) {       Component[] c = container.getComponents();       for (Component res : c) {          if (res instanceof AbstractButton) {             container.remove(res);          }       }    } }Output

The following is an example to handle action event for JComboBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; public class SwingDemo {    public static void main(String[] args) throws Exception {       JFrame frame = new JFrame();       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       JComboBox combo = new JComboBox(new String[] { "One", "Two", "Three", "Four", "Five", "Six" });       JButton add = new JButton("Add");       add.addActionListener(new ActionListener() {          @Override          public void actionPerformed(ActionEvent e) {             ... Read More

The following is an example to add items on runtime on a JComboBox in Java:Exampleimport java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; public class SwingDemo {    public static void main(String[] args) throws Exception {       JFrame frame = new JFrame();       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       JComboBox combo = new JComboBox(new String[] { "One", "Two", "Three", "Four", "Five", "Six" });       JButton add = new JButton("Add");       add.addActionListener(new ActionListener() {          @Override          public void actionPerformed(ActionEvent e) {         ... Read More

First, create a List with String elements:List myList = new ArrayList(); myList.add("pqr"); myList.add("stu"); myList.add("vwx"); myList.add("yza"); myList.add("bcd"); myList.add("efg"); myList.add("vwxy");Use the startsWith() method to check if any of the above string in the myList begins with a specific letter:myList.stream().anyMatch((a) -> a.startsWith("v"));TRUE is returned if any of the string begins with the specific letter, else FALSE.The following is an example to check if any String in the list starts with a letter:Exampleimport java.util.ArrayList; import java.util.List; public class Demo {    public static void main(final String[] args) {       List myList = new ArrayList();       myList.add("pqr");       myList.add("stu"); ... Read More

In this article, we will learn to get the reverse of an Integer array with Lambda expressions in Java. By utilizing the Arrays.sort() method along with a custom comparator defined as a lambda expression, we can efficiently reorder the elements of the array in descending order. Lambda expressions are a concise way to represent functional interfaces, allowing you to write cleaner and more readable code. Problem Statement Write a program in Java to get the reverse of an Integer array with Lambda expressions − Input arr = {20, 50, 75, 100, 120, 150, 170, 200} Output Integer Array elements... 20 50 ... Read More

At first, let us create and array of strings:String[] strArr = { "ABCD", "AB", "ABCDEFG", "ABC", "A", "ABCDE", "ABCDEF", "ABCDEFGHIJ" }Now, for longest to shortest pattern, for example ABCDEFGHIJ, ABCDEFG, ABCDEF, etc.; get the length of both the string arrays and work them like this:Arrays.sort(strArr, (str1, str2) → str2.length() - str1.length());The following is an example to sort array of strings by their lengths with longest to shortest pattern in Java:Exampleimport java.util.Arrays; public class Demo {    public static void main(String[] args) {       String[] strArr = { "ABCD", "AB", "ABCDEFG", "ABC", "A", "ABCDE", "ABCDEF", "ABCDEFGHIJ" };     ... Read More