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Programming Articles
Page 1578 of 2547
Convert day of year to day of month in Java
Firstly, set the day of year using DAY_OF_YEAR constant.Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, 2018); cal.set(Calendar.DAY_OF_YEAR, 320);Now, get the day of month −int res = cal.get(Calendar.DAY_OF_MONTH);The following is an example −Exampleimport java.util.Calendar; public class Demo { public static void main(String[] args) { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, 2018); cal.set(Calendar.DAY_OF_YEAR, 320); System.out.println("Date = " + cal.getTime()); int res = cal.get(Calendar.DAY_OF_MONTH); System.out.println("Day of month = " + res); } }OutputDate = Fri Nov 16 07:54:55 UTC 2018 Day of month = 16
Read MoreCreating a string from a subset of the array elements in Java
To get a string from a subset of the character array elements, use the copyValueOf() method. This method returns a String that represents the character sequence in the array specified.Here is our character array.char[] ch = { 'T', 'E', 'S', 'T', 'I', 'N', 'G'};Now, let us create a string from the subset of the above array elements.String str = String.copyValueOf(ch, 4, 2);Examplepublic class Demo { public static void main(String[] args) { char[] ch = { 'T', 'E', 'S', 'T', 'I', 'N', 'G'}; String str = String.copyValueOf(ch, 4, 2); System.out.println(str); } }OutputIN
Read Moreisless() in C/C++
The function isless() is used to check that first argument is less than the second one. It is declared in “math.h” header file in C language. It returns true if successful otherwise it returns false.Here is the syntax of isless() in C language, bool isless(value1 , value2);Here, value1 − This is the first argument which will be checked with value2.value2 − This is the second argument which is used to check value1 ans see that it is less or not.Here is an example of isless() in C language, Example#include #include int main() { int val1 = 48; ...
Read MoreWhen should you use a class vs a struct in C++?
Structures and classes are very similar in C++ except for some differences. So details about these differences are given below that help to decide when to use a class or structure in C++.Differences between Class and StructureAll the members of a class are private by default. This is different compared to structures as all the members of a structure are public by default.A program that demonstrates a class in C++ is given as follows −Example#include using namespace std; class Example { int val; }; int main() { Example obj; obj.val = 20; return 0; }This ...
Read MoreGet floor value of a number using Math.floor in Java
To get the floor value of a number, we use the java.lang.Math.floor() method. The Math.floor() method returns the largest (closest to positive infinity) double value which is less than or equal to the parameter and has a value which is equal to a mathematical integer on the number line. If the parameter is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.Declaration - The java.lang.Math.floor() method is declared as follows −public static double floor(double a)Let us see a program to get the floor value of a number in Java.Exampleimport java.lang.Math; ...
Read MoreEnum for days of week in Java
To set enum for days of the week, set them as constantsenum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }Now create objects and set the above constants −Days today = Days.Wednesday; Days holiday = Days.Sunday;The following is an example −Examplepublic class Demo { enum Days { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday } public static void main(String[] args) { Days today = Days.Wednesday; Days holiday = Days.Sunday; System.out.println("Today = " + today); System.out.println(holiday+ " is holiday"); } }OutputToday = Wednesday Sunday is holiday
Read MoreHeader files "stdio.h" and "stdlib.h" in C
stdio.hThe header file stdio.h stands for Standard Input Output. It has the information related to input/output functions.Here is the table that displays some of the functions in stdio.h in C language, Sr.No.Functions & Description1printf()It is used to print the strings, integer, character etc on the output screen.2scanf()It reads the character, string, integer etc from the keyboard.3getc()It reads the character from the file.4putc()It writes the character to the file.5fopen()It opens the file and all file handling functions are defined in stdio.h header file.6fclose()It closes the opened file.7remove()It deletes the file.8fflush()It flushes the file.Here is an example of stdio.h in C language, ...
Read MoreHow to prevent Cloning to break a Singleton Class Pattern in Java?
A Singleton pattern states that a class can have a single instance and multiple instances are not permitted to be created. For this purpose, we make the constructor of the class a private and return a instance via a static method. But using cloning, we can still create multiple instance of a class. See the example below − Example - Breaking Singleton public class Tester{ public static void main(String[] args) throws CloneNotSupportedException { A a = A.getInstance(); ...
Read MoreJava Program to construct one String from another
To construct on string from another, firstly take a charcter array for the first string.char ch[] = { 'A', 'M', 'I', 'T' }; String str1 = new String(ch);The above forms first string. Now, let us created another string from the first string.String str2 = new String(str1);In this way, we can easily construct one string from another.Examplepublic class Demo { public static void main(String[] args) { char ch[] = { 'A', 'M', 'I', 'T' }; String str1 = new String(ch); String str2 = new String(str1); String str3 = ...
Read MorePrivate and Protected Members in C++
A class in C++ has public, private and protected sections which contain the corresponding class members.The private data members cannot be accessed from outside the class. They can only be accessed by class or friend functions. All the class members are private by default.The protected members in a class are similar to private members but they can be accessed by derived classes or child classes while private members cannot.A program that demonstrates private and protected members in a class is given as follows −Example#include using namespace std; class Base { public : int a = 8; ...
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