Constant member functions in C++ class are declared using const keyword, for example, int fun() const. A constant member function of a class cannot modify any non-constant data members of the class and also cannot call non constant member functions. For example, in below C++ program, function getProductId()is constant and hence, if try to modify […]
itoa C++ – Integer to String Conversion
itoa C++ typecast function is used for integer to string conversion. The converted string can be in binary, decimal or hexa decimal form depending upon base i.e. 2, 10 or 16 respectively. itoa() C++ Syntax : function itoa() C++ program example This code demonstrate how to convert integer to string in C++ programs using itoa() […]
Check prime number in C++
Check prime number in C++ – Program to check if a number is a prime number or not in C++ with example. What is Prime Number? Prime number is number which is divided by 1 or itself and cannot be divided by other numbers. For example, 2,3,5,7,11 etc. are prime numbers. Important points: Value less […]
Check if char is number C++ – Using isDigit ()
Check if char is number C++ – Example to check if a character is a number or digit using isdigit(int c) library function. Note that digits can be 0, 1, 2 ,3, 4, 5 ,6, 7, 8, 9 . To use the function isDigit, the header file #include <cctype> need to be included. C++ Program example – […]
Sum of digits in a string C++ Program
Sum of digits in a string C++ – find digits in a given string and calculate the sum of all digits. For example, if a given string is “hello65”; then sum of digits present in the string is 6+5 = 11. isDigit() C++ library function will be used to check if char is a digits. […]
Min stack C++ in constant time – Simple logic
Simple Min stack C++ example that retrieve minimum element in constant time. Logic is very simple. Time complexity to pop a value from the stack is constant. Hence, implementation will use two stacks i.e. one to keep value and another stack to keep minimum value. For implementation STL stack will be used. Logic: Create two […]
Copy one queue to another C++ example
Copy one queue to another C++ program example. Items will be inserted in a std::queue and this queue will be copied to a temporary queue. One use case is, If we want to process the entire items from a queue but don’t want them to be removed from the queue then we need a temporary […]
C++ std::queue example using STL
C++ std::queue example – Program will include example of functions queue push , front, pop and size. Queue stores data in FIFO ( First in first out manner). Elements in the queue are inserted from end using push() function and deleted form front using pop() function of the queue. Header file required : “#include <queue>” […]
Balanced parentheses using stack in C++
Check balanced parentheses using stack in C++ with program example. Problem statement: String of parenthesis is given for example “((())) “ or ({}) etc. and we need to find out if they are balanced. Means, if there are matching pairs or not. for example, ({}) is balanced parentheses and ((((()) is not a balanced parenthesis. […]
C++ Hello World program example
C++ hello world program example. This is very short hello world start up program. This C++ program will print hello world on console. Before explanation about this start up program, first let’s see how a simple hello world program in CPP looks like. C++ Hello World statements Explanation #include<iostream> We must include <iostream> header file […]