Here we will see what are the unary operators in C / C++. Unary operator is operators that act upon a single operand to produce a new value. The unary operators are as follows.OperatorDescriptionIndirection operator (*)It operates on a pointer variable and returns an l-value equivalent to the value at the pointer address. This is called "dereferencing" the pointer.Address-of operator (&)The unary address-of operator (&) takes the address of its operand. The operand of the address-of operator can be either a function designator or an l-value that designates an object that is not a bit field and is not declared ... Read More

Here we will see what are the type conversion techniques present in C++. There are mainly two types of type conversion. The implicit and explicit.Implicit type conversionThis is also known as automatic type conversion. This is done by the compiler without any external trigger from the user. This is done when one expression has more than one datatype is present.All datatypes are upgraded to the datatype of the large variable.bool -> char -> short int -> int -> unsigned int -> long -> unsigned -> long long -> float -> double -> long doubleIn the implicit conversion, it may lose ... Read More

Here we will see some good reasons behind taking the language C++ as our favorite programming language. We know that C++ is one of the most popular object oriented programming language. These are the reasons behind taking the C++ into consideration.C++ Popularity and High salary −C++ is one of the most popular language in the world. It is used nearly 4.4 million developers worldwide. The C++ developers hold highest paying jobs in the industry with an average base pay of $100000 per year.C++ has abundant library supportv −C++ has Standard Template Library (STL). This helps to write code compactly and ... Read More

Here we will see how to design timer in C++ using a system call. We will not use any graphics or animations. Here timer means the stopwatch, that is up-counting the time. The used system calls are −sleep(n) − This will help the program to sleep for n number of secondssystem() − This is used to execute the system command by passing command as an argument to this function.Example Live Demo#include #include #include #include using namespace std; int hrs = 0; int mins = 0; int sec = 0; void showClk() {    system("cls");    cout

Here we will see some important C++ interview questions.What are the differences between C and C++?KeyCC++IntroductionC was developed by Dennis Ritchie in around 1969 at AT&T Bell Labs.C++ was developed by Bjarne Stroustrup in 1979.Language TypeAs mentioned before C is procedural programming.On the other hand, C++ supports both procedural and object-oriented programming paradigms.OOPs feature SupportAs C does not support the OOPs concept so it has no support for polymorphism, encapsulation, and inheritance.C++ has support for polymorphism, encapsulation, and inheritance as it is being an object-oriented programming languageData SecurityAs C does not support encapsulation so data behave as a free entity ... Read More

Suppose we have an array of dates. Here we will see how to sort then using C or C++ code. The dates are stored in a class (struct can be used in C also). We will use the sort function of the C++ STL. For comparing dates, we have to write our own compare function that will be used in the sort function. Let us see the example to get better view.Example Live Demo#include #include #include using namespace std; class Date {    public:       int d, m, y; }; bool compare(const Date &date1, const Date &date2){    if ... Read More

Here we will see how to read integer from user and display in C++. To take input we will use the cin operator, and to display we will use cout operator. The syntax will be like −Input −int x; cin >> x;Output −int x = 110; cout x;    cout

Suppose we have a string. We have to find the balancing position count in that string from where left and right part of the string contains same characters. The frequency of characters does not matter. So if the string is “ABAABA”, then the number of balancing positions is 3. These positions are AB|AABA, ABA|ABA, ABAA|BA.To solve this, we will follow some efficient approach. After traversing the string we first feel right[] with counts of all characters. Then traverse the string from left to right. For every character we increment its count in left[] and decrement the count in right. For ... Read More

Suppose we have two arrays X and Y of positive integers. Find the number of pairs such that x^y > y^x, where x is an element of X and y is an element of Y. Suppose the X = [2, 1, 6], and Y = [1, 5], then output will be 3. As there are three pairs, these are (2, 1), (2, 5) and (6, 1)We can solve this in an efficient way. The logic is simple, it will be when y > x then x^y > y^x with some exceptions. So this is the trick.Sort the array Yfor each ... Read More

Suppose we have three stacks of positive numbers. We have to find the possible equal maximum sum of stacks with removal of top elements allowed. The stacks are represented as an array. The first index of the array represents the top element of the stack. Suppose the stack elements are like [3, 10], [4, 5] and [2, 1]. The output will be 0. The sum can only be equal after removing all elements from all stacks.To solve this, we will follow this idea. The idea is to compare the sum of each stack, if they are not equal, then remove ... Read More