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To get the elapsed time of an operation in days in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.Declaration −The java.lang.System.currentTimeMillis() is declared as follows −public static long currentTimeMillis()The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).Let us see a program to compute the elapsed time of an operation in days in Java −Example Live Demopublic class Example { public static void main(String[] args) throws Exception { // finding the time before the operation is executed long ... Read More
g++GNU C++ Compiler ( g++ ) is a compiler in Linux which is used to compile C++ programs. It compiles both files with extension .c and .cpp as C++ files.The following is the compiler command to compile C++ program.g++ program.cpp -o filenameHere,filename − The name of file with .c or .cpp extension.The following is an example of using g++ compiler.Example Live Demo#include using namespace std; int main() { int a = 20; cout
intThe datatype int is used to store the integer values. It could be signed or unsigned. The datatype int is of 32-bit or 4 bytes. It requires less memory area than long to store a value. The keyword “int” is used to declare an integer variable.The following is the syntax of int datatype.int variable_name;Here,variable_name − The name of variable given by user.The following is an example of int datatype.Example Live Demo#include using namespace std; int main() { int a = 8; int b = 10; int c = a+b; cout
In order to get a copy of a TimeZone object in Java, we use the clone() method. The clone() method creates of a copy of the TimeZone.Declaration −The java.util.TimeZone.clone() method is declared as follows −public Object clone()Let us see a Java program which creates a copy of the TimeZone object using the clone() method −Example Live Demoimport java.util.*; public class Example { public static void main( String args[] ) { // creating object of TimeZone TimeZone obj = TimeZone.getDefault(); System.out.println("Initial object: " + obj); // copying the TimeZone ... Read More
In order to compute maximum element of ArrayList with Java Collections, we use the Collections.max() method. The java.util.Collections.max() returns the maximum element of the given collection. All elements must be mutually comparable and implement the comparable interface. They shouldn’t throw a ClassCastException.Declaration −The Collections.max() method is declared as follows −public static T max(Collection c)where c is the collection object whose maximum is to be found.Let us see a program to find the maximum element of ArrayList with Java collections −Example Live Demoimport java.util.*; public class Example { public static void main (String[] args) { List list ... Read More
You can include a precision specifier to the following format specifiers −%f %e %g %sOn floating point, the number of decimal places is known.Let’s say we declared a Formatter object −Formatter f1 = new Formatter();Now, we want 3 decimal places. For that, use 1.3f −f1.format("%1.3f", 29292929.98765432);The above will return the number with 3 decimal places −29292929.988The following is the final example −Example Live Demoimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f1, f2, f3; f1 = new Formatter(); f1.format("%1.3f", 29292929.98765432); System.out.println(f1); f2 = new Formatter(); f2.format("%1.7f", 29292929.98765432); System.out.println(f2); ... Read More
To add leading zeros to a number, you need to format the output. Let’s say we need to add 4 leading zeros to the following number with 3 digits.int val = 290;For adding 4 leading zeros above, we will use %07d i.e. 4+3 = 7. Here, 3, as shown above, is the number with 3 digits.String.format("%07d", val);The following is the final example.Example Live Demoimport java.util.Formatter; public class Demo { public static void main(String args[]) { int val = 290; System.out.println("Integer: "+val); String formattedStr = String.format("%07d", val); System.out.println("With leading zeros = " + formattedStr); } }OutputInteger: 290 With leading zeros = 0000290
To get all the IDs of the TimeZone in Java, we use the getAvailableIDs() method. The getAvailableIDs() method returns all the available IDs which are compatible.Declaration −The java.util.TimeZone.getAvailableIDs() method is declared as follows −public static String[] getAvailableIDs()Let us see a Java program which gets all the IDs of the Time Zone:Example Live Demoimport java.util.*; public class Example { public static void main(String args[]) { // getting available supported ids String[] id = TimeZone.getAvailableIDs(); // printing available ids System.out.println("The available IDs are as follows:"); for (int ... Read More
In order to get the IDs according to the given time zone offset in Java, we use the getAvailableIDs(int rawOffset) method. The java.util.TimeZone.getAvailableIDs(int rawOffset) method returns the available IDs according to the given time zone offset in the arguments.Declaration − The java.util.TimeZone.getAvailableIDs(int rawOffset) method is declared as follows −public static String[] getAvailableIDs(int rawOffset)where rawOffset is the given time zone GMT offset.Let us see a Java program which gets the IDs according to the given time zone offset −Example Live Demoimport java.util.*; public class Example { public static void main(String args[]) { // getting available supported ids for ... Read More
The following is an example to catch a divide by zero error.Example Live Demo#include using namespace std; int display(int x, int y) { if( y == 0 ) { throw "Division by zero condition!"; } return (x/y); } int main () { int a = 50; int b = 0; int c = 0; try { c = display(a, b); cout