Programming Articles - Page 2643 of 3363

Here we will see how to compare two floating point data or two double data using C or C++. The floating point / double comparison is not similar to the integer comparison.To compare two floating point or double values, we have to consider the precision in to the comparison. For example, if two numbers are 3.1428 and 3.1415, then they are same up to the precision 0.01, but after that, like 0.001 they are not same.To compare using this criteria, we will find the absolute value after subtracting one floating point number from another, then check whether the result is ... Read More

Here we will see how to trim the strings in C++. The trimming string means removing whitespaces from left and right part of the string.To trim the C++ string, we will use the boost string library. In that library, there are two different methods called trim_left() and trim_right(). To trim string completely, we can use both of them.Example#include #include using namespace std; main(){    string myStr = " This is a string ";    cout

In C, the strings are basically array of characters. In C++ the std::string is an advancement of that array. There are some additional features with the traditional character array. The null terminated strings are basically a sequence of characters, and the last element is one null character (denoted by '\0'). When we write some string using double quotes ("..."), then it is converted into null terminated strings by the compiler. The size of the string may smaller than the array size, but if there are some null character inside that array, that will be treated as the end of that ... Read More

Here we will see how to hide some string into some binary code (Here binary code is represented in hexadecimal number).The approach is very simple. We can use the string stream to convert decimal number to hexadecimal numbers. Now from the string, we will read each character, and take its ASCII value, these ASCII values are converted into hexadecimal values. Then we can print them one by one.Example#include #include using namespace std; string dec_to_hex(int decimal){ //function is used to convert decimal to hex    stringstream my_ss;    my_ss

Here we will see the string stream in C++. The string stream associates a string object with a string. Using this we can read from string as if it were a stream like cin.The Stringstream has different methods. These are like below −clear(): Used to clear the streamstr(): To get and set the string object whose content is present in streamoperator > : This is used to read from stringstream object.Let us see two examples of string streams. In the first program we will divide the words into separate strings.Example#include #include #include #include using namespace std; ... Read More

Here we will see how we can create a system, where we will create one client, and a server, and the client can send one string to the server, and the server will reverse the string, and return back to the client.Here we will use the concept of socket programming. To make the client server connection, we have to create port. The port number is one arbitrary number that can be used by the socket. We have to use the same port for client and the server to establish the connection.To start the program, start the server program first −gcc ... Read More

The POSIX stands for Portable Operating System which was developed by IEEE (Institute of Electrical and Electronics Engineers). This is UNIX based operating system that is used for both system calls and library functions. The semaphores are used in the process of multithreading and synchronization. For eg. file sharing and memory management. It can be named or unnamed. Multithreading is the process of executing multiple tasks in the same instance of time while synchronization is used to control the thread to work in a sequential manner. It is important for data security. Using Semaphores in C language To use ... Read More

The self-destructing code is a type of program that can delete itself. It automatically executes the program and then removes the executable file once the execution is done. In this article, we will learn how to write self-destructing code for a C program. Write a Self Destructing Code in C++ You can write a self-destructing program that deletes its own executable file after it finishes running by using the remove() function. The remove() function is a built-in function from the C standard library () that deletes the specified file from the file system. To delete the program's own executable file, ... Read More

In C++11, the lambda was introduced. Lambdas are basically a part of code, that can be nested inside other function call statements. By combining lambda expressions with the auto keyword, they can be used later.In C++14, these lambda expressions are improved. Here we can get the generalized lambda. For example, if we want to create a lambda, that can add integers, add numbers, also concatenate strings, then we have to use this generalized lambda.Syntax of the lambda expression is looking like this:[](auto x, auto y) { return x + y; }Let us see one example to get the better idea.Example#include ... Read More

To print random numbers within a range, we will have two input variables where we need to set the maximum and minimum values. Using these two values, we can display a random value within the specified range. Example Following is the input-output statement to understand the range of a random number: Input: min = 4, max = 14 Output: 8, 10, 7 Explanation: Any numeric value between 4 and 14 can be displayed in the specified range. Generate Random Number Within a Range Using rand() with Modulus The rand() function generates the random number while modulus operator return ... Read More