Programming Tutorials & Tech
In this tutorial, you will learn how to get array length in C++. In C++, you can use the size() method to get the array length. Below is the syntax of the size() method: Syntax arrayname.size() Initialize Array in C++ array<int,8> a = { 1, 5, 2, 4, 3, 6, 8, 7 }; Using size() ... Read more
In this tutorial, we will see a C++ multimap example to find a value in a map with duplicate key values. C++ Header Files for multimap Program #include <iostream> #include <map> #include <vector> #include <iterator> #include <algorithm> multimap Initialization in C++ multimap< string, long > contacts = { { "V.Jegan", 2232342323 }, { "R.Meena", 3243435323 ... Read more
If your question is to get a value by key using a C++ map or C++ map to check if a key exists or find in a map in C++ then the following C++ map example will answer these questions. What is Map in C++? In C++, maps are associative containers for storing elements in ... Read more
In C++, you can declare a variable anywhere in the block before you reference it. When the variable's declaration is close to its use, its purpose and behavior can be easier to understand. Below is an example of variable declaration in the C++ program. Example 1: Variable Declaration in C++ #include <iostream> main() { cout ... Read more
Nowadays, most interviewers ask the candidate to write the FizzBuzz program. So here I am, giving the 10+ programming languages FizzBuzz program examples. These examples will help you learn how to do it in the most popular programming languages. What is FizzBuzz Program? In the FizzBuzz program, you have to write the following logic: For ... Read more
This tutorial shows how to do switch from pointer to member functions in C++ through an example. Example: Pointer to Member functions in C++ Suppose you want to do is a "switch" using a function pointer, but using the method pointers. This can be done using std::invoke from <functional> header in C++ (2017). #include <iostream> #include <functional> ... Read more
This tutorial shows how to print the address of an iterator in C++. Example: C++ Print Iterator Address #include <iostream> #include <vector> std::ostream &operator<<(std::ostream &os, const std::vector::iterator &i) { os << &i; return os; } int main(int argc, const char *argv[]) { std::vector inputs = {15, 20, 10, 5, 19}; std::vector::iterator i; i = inputs.begin(); ... Read more
Here is an example of a login authentication program in C++ using a dictionary object to store usernames and passwords. Example: C++ Authentication Program The following C++ program using the map function to create a dictionary object and using the map's find method to check whether the key exists or not. #include <iostream> #include <map> ... Read more
The error "DNSSD Crash After Calling fd_set on its Socket" occurs on macOS because too many file descriptors are open in C++. This can be solved by increasing the rlimit using the following code: Solving - macOS Error: DNSSD Crash After Calling fd_set on its Socket void setup_min_fd(int min_fds) { struct rlimit rlim; if (getrlimit(RLIMIT_NOFILE, ... Read more
This C++ tutorial shows how to make the std::map::find function case sensitive. Case Sensitive Search Using the map in C++ Example The below example will look for the "FOX" string in uppercase using the map function and, if found, then will print on the console: #include <iostream> #include <map> using namespace std; int main() { ... Read more