Server Side Programming Articles - Page 1955 of 2646

Suppose we have a list of vertices, and their degrees are given. We have to generate one undirected graph from that degree sequence. It will not include loop or multiple edges. So if the degree sequence is like [2, 2, 1, 1], then the graph can be likeTo solve this, we will follow these steps −Define adjacency matrix adj to store the graphfor each vertex i, dofor each vertex j that is valid, and next to iif the degree of vertex i and j are more than zero, then connect themdisplay the matrix.Example Live Demo#include #include using namespace std; ... Read More

Suppose we have two integers x and n. We have to find the array such that it contains the frequency of index numbers occurring in (x^1, x^2, … x^(n – 1), x^n). So if x = 15 and n = 3, then output will be [0, 1, 2, 2, 0, 3, 0, 1, 0, 0]. As we know that x^1 to x^n, the values are 15, 225 and 3375. So the frequency array is 0, 1, 2, 2, 0, 3, 0, 1, 0, 0To solve this, we will follow these steps −Maintain the frequency count array to store the counts ... Read More

Here we will see one amazing trick in C or C++. The array subscript A[i] can also be written as i[a]. In C/C++ E1[E2] is defined as (*((E1) + (E2))). The compiler performs arithmetic internally to access the array elements. Because of the conversion of rules, that is applied to the binary + operator, if E1 is an array object, and E2 is an integer, then E1[[E2] signifies the E2th element in the E1 array. So A[B] can be defined as *(A + B), so B[A] = *(B + A). so they are basically the same thing.Example Live Demo#include using ... Read More

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

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