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Programming Articles
Page 1609 of 2547
Java public static void main(String[] args)
The Java program starts execution when the JVM calls the main() method. A Java application begins with this method. Without a main() method, a Java file will compile successfully because at compile time, the compiler doesn't check for a main method, but at run time JVM checks whether the main() method is available or not. Therefore, we will get an exception at run time. In this article, we will understand why we follow the convention "public static void main(String[] args)." The Syntax of a basic Java program looks like: public class class_name { // This line must be ...
Read MoreJava Program to Calculate difference between two Time Periods
We are given two time periods, and our task is to write a Java program to calculate the difference between them. For this problem, we can use classes and methods of java.time, java.util, and java.text packages. SimpleDateFormat class Date class LocalDate class Period class parse() method between() method As we move further in this article, we will understand the uses of these classes and methods in calculating the difference between two time periods. Some examples ...
Read MoreJava Program to Check Whether a Number can be Expressed as Sum of Two Prime Numbers
The given task is to write a Java program to check if an integer can be expressed as the sum of two prime numbers. A number is said to be a prime if it has only two factors, which are 1 and itself, and cannot be divided by any other number. Some examples of prime numbers are 2, 3, 5, 7, 11, 13, and so on. 2 is the only even prime number; all other prime numbers are odd numbers. Example Scenario Let's understand the problem with an example. The possible solution is 43 = 2 + 41. Here, 2 and ...
Read MoreReverse Words in a String in C++
In this article, we have a string. Our task is to reverse the words in the given string. Here is an example of reversing the words of a string: Example The example below reverses the words of the given string: Input: "I am Viper" Output: Viper am I Here are the approaches to reverse the words of a string: Using Two Pointer Approach Using STL reverse() Function Using stringstream with Vector Using Recursive Approach ...
Read MoreJava Nested Loops with Examples
Loops in Java are called control statements because they decide the flow of execution of a program based on some condition. Java allows the nesting of loops. When we put a loop within another loop, then we call it a nested loop. Nested loops are used when we need to iterate through a matrix array and when we need to do any pattern-based questions. In this article, we are going to learn about Java nested loops with examples. Nested Loops in Java We can create nested loops for the following control statements in Java: ...
Read MoreJava Program to Reverse a Number
For a given input number, write a Java program to reverse its digits. In reverse operation, we print the digits of given number from the last to start. The digit at the last position is swapped with the digit at the first position, the second last digit is swapped with second position digit and so on. Example Scenario: Input: number = 123456; Output: rev_number: 654321 How to Reverse a Number in Java? There are multiple ways to reverse the digits of a given number. We are going to discuss the following: Using ...
Read MoreHow to print the elements of a HashMap in Java?
In Java, a HashMap is a subclass of the AbstractMap class and is used to store key-value pairs. Each key in the map is mapped to a single value in the map, and the keys are unique.Printing Java HashMap Elements We can insert a key only once in a map, and duplicate keys are not allowed, but the value can be mapped to multiple keys. We can add the elements using the put() method of the HashMap class and iterate over the elements using the Iterator interface. Java HashMap provides various ways to print its elements as follows: ...
Read MoreChecking if a double (or float) is NaN in C++
In this article we will check whether a double or floating point number is NaN (Not a Number) in C++. Checking if a Double or Floating Point Number is NaN To check, we can utilise the isnan() method. The isnan() function is available in the cmath library. This function was introduced in C++ version 11. So From C++11 next, we can use this function. The isnan() function is used to determine whether a double or floating point number is not-a-number (NaN) value. Return true if num is NaN, false otherwise. C++ Program to Check Double or Float Number is NaN ...
Read MoreDifference between namespace and class in C++
In this article, we will see the differences between namespace and class in C++. Namespace and classes are two different concepts, so let's discuss them: Classes are datatypes. It is an expanded version of the structures. Classes can contain data members and functions as members, but namespaces can contain variables and functions by grouping them into one and cannot be created as objects; it is used as additional information to differentiate similar functions, classes, variables, etc. Variables, functions with the same name can be placed in different namespaces. What is Namespace? The namespace is a feature that provides a way ...
Read MoreHeap overflow and Stack overflow
Heap and stack overflows are both types of buffer overflows that occur when a program attempts to write data beyond the allocated boundary of a buffer. Heap Overflow Heap is used to store dynamic variables. It is a region of process’s memory. malloc(), calloc(), resize() all these inbuilt functions are generally used to store dynamic variables. Following are the regions where heap overflow occurs − If we allocate dynamic large number of variables int main() { float *ptr = (int *)malloc(sizeof(float)*1000000.0)); } If we continuously allocate memory and do not free after using it. int main() { for (int i=0; i
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