Programming Articles - Page 367 of 3363

In Golang, the functions os.openfile () and ioutil.Writefile() are used to access/open a file in read-write mode without truncating it. In this article, we will understand the functionality of these two functions using two different methods. In the first method we will use the OpenFile() function present in os package and In the second method, we will use the WriteFile() function to implement the result. Syntax os.OpenFile() The OpenFile() function is present in os package and is used to open a file. The function accepts the file to be opened as argument to the function along with ... Read More

In Golang, we can use OS functions os.OpenFile(), os.Create() and ioutil.WriteFile to open a write-only file. Here we are going to see three different Examples to understand the functionality of these functions. In the first program we will use the OpenFile() function while in the second and third program, we will use the writeFile() and create() function respectively. Syntax func WriteFile(filename string, data []byte, perm os.FileMode) error The WriteFile() function is present in the ioutil package and is used to write the data in the file. The function accepts the name of file in which data is to be ... Read More

The number system is of four types: Binary, Octal, Decimal and Hexadecimal with base value 2, 8, 10 and 16 respectively. The base value depends on the number of digits contained by number system. For example, hexadecimal number system contains 16 digits i.e. 0 to 9 and A to F. Hence, its base is 16. In this article, we will discuss the binary and decimal number systems. Also, we will make java programs to convert decimal to binary numbers. Binary and Decimal number system Binary number system Binary number system works in the form of 0s and 1s. Since ... Read More

An array is a linear data structure that stores a group of elements with similar datatypes, in a sequential order. Once we create an array, we can’t change its size, i.e., it can store a fixed number of elements. In this article, we will learn how to write a Java program where we create an array and perform the right rotation using the reversal algorithm. Right Rotation of an Array Let’s understand the term right rotation in the context of an array. In the right rotation of an array, we simply shift the elements of the array to our right till the specified number ... Read More

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 More

The given task is to write a Java program to convert it into its equivalent decimal number system. The base value of hexadecimal is 16, and decimal is 10. When we convert the hexadecimal to decimal, the base value 16 will be changed to 10. The number system is of four types: Binary, Octal, Decimal, and Hexadecimal. The base value depends on the number of digits contained by the number system. For example, the binary number system contains only two digits, 0 and 1. Hence, its base is 2. Hexadecimal Number System It represents the numbers from 0 to 9 ... Read More

The given task is to write a Java program that converts an integer into a character. The int and char are primitive datatypes of Java. The int is a 32-bit signed datatype used to store whole numbers, and char holds 16-bit unsigned Unicode characters. The int and char keywords are used to declare an integer variable and a character variable, respectively. We store character variables in a single quotation (' '). Example Scenario To understand the problem statement, let's see an example scenario: Input: int num1 = 83; Output: ch = 'S' Here, num1 is the name of a ... Read More

Array is a linear data structure that is used to store a group of elements with similar data types. It stores data in a sequential manner. When we create an array of two dimensions, i.e., rows and columns, we call it a matrix. In this article, we will create a matrix of M x N and try to rotate it right by K times. Here, M and N are the size of the row and column, respectively. K is the number of times we want to rotate the matrix. Example Scenarios Let's understand what matrix rotation is with the following ... Read More

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 More

Array is a linear data structure that is used to store a group of elements with the same data type. We can create an array with primitive datatypes, and since a class is considered a user-defined datatype in Java,  it is also possible to create an array of objects. In this article, we are going to discuss object arrays. First of all, let's discuss what is an object array, in Java. What is Object array or Array of Objects An array of objects contains reference variables of objects.We follow the same syntax to create an array of primitives and an array ... Read More