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Articles by Nishu Kumari
Page 3 of 9
Adding one to number represented as array of digits in C++?
In this problem, we are given a number in the form of an array, and each digit of the number is stored at one index of the array, and the most significant digit comes first. Our task is to add 1 to this number and return the updated number in the same array format. Let's understand it with some example scenarios. Scenario 1 Input: Input_arr[] = {2, 6, 1} Output: 262 Explanation: The array represents 261. Adding 1 gives 261 + 1 = 262. Scenario 2 Input: input_arr[] = {5, 9, 9, 9} Output: 6000 Explanation: The array ...
Read MoreAlternate Odd and Even Nodes in a Singly Linked List in C++
Given a singly linked list, we need to rearrange its nodes so that even and odd numbers come one after the other alternatively. If the list starts with an even number, the next should be odd, then even, and so on. Similarly, if it begins with an odd number, the next should be even, then odd, and so on. Let's look at some example scenarios to understand the concept better. Scenario 1 Input: 45 -> 21 -> 2 -> 213 -> 3 -> 34 -> 78 -> 12 Output: 45 -> 2 -> 21 -> 34 -> 213 -> 78 ...
Read MoreAdditive Number in C++
We are given a string containing only digits from 0 to 9, and we need to check whether it is an additive number. An additive number is a string that can form an additive sequence, where each number (starting from the third) is the sum of the previous two. For the sequence to be valid, it must have at least three numbers. Let's look at the example scenarios to understand the problem clearly: Scenario 1 Input: "112358" Output: true Explanation: The digits can form the sequence: 1, 1, 2, 3, 5, 8 Here, 1 + 1 = 2 1 ...
Read MoreAdd Bold Tag in String in C++
A string is a sequence of characters, like words, numbers, or sentences, enclosed in double quotes ("). The given task is to add a closed pair of HTML bold tags around a string using C++.Let us understand this with an example: Input: abc Output: abc Add Bold Tag in String in C++ To add bold tags to a string in C++, we use string concatenation. This is the process of joining two or more strings together to form a new string. In C++, this can be done using the '+' operator. To wrap a string with bold ...
Read MoreAdd two numbers using ++ operator in C++.
Adding two numbers is a basic arithmetic operation, where we simply combine their values to get the total. The given task is to add two numbers using the "++" operator in C++. Let's understand this with an example: Scenario 1 // Adding two numbers using '+' operator Input: a = 7, b = 3 Output: 10 Explanation: a + b => 7 + 3 = 10 Scenario 2 // Adding two numbers using '++' operator Input: a = 7, b = 3 Output: 10 Explanation: a + b => 7 + 1 + ...
Read MoreProgram to add two binary strings in C++
In this problem, we are given two binary strings, and we need to find their sum and return the result as a binary string. A binary string is a string that contains only the characters '0' and '1', where 0 and 1 are binary numbers. While adding two binary numbers, we follow the binary addition rules given below - 1 + 0 = 1 0 + 1 = 1 0 + 0 = 0 1 + 1 = 0 with a carry of 1 ...
Read MoreAdvantages of vector over array in C++
In C++, both arrays and vectors are used to store elements, but the main difference is that arrays have a fixed size and cannot be changed once initialized. Whereas, vectors are dynamic, i., e we can change their size during runtime. In this article, we'll look at the advantages of using vectors over arrays in C++. Here's how we declare an array and a vector in C++: // Declaring an array int arr[5]; // Fixed-size array of 5 integers // Declaring a vector #include std::vector vec; // Dynamic vector of integers Advantages of ...
Read MoreAdd Two Numbers II in C++
We're given two singly linked lists, where each node stores one digit of a number. The digits are arranged from left to right, just like how we normally write numbers. For example: 7 -> 2 -> 4 -> 3 represents the number 7243. Our task is to add these two numbers and return the sum as a new linked list in the same (left-to-right) order. The input number can contain zeroes at the start, but in the output, there should not be any leading zeros. Let's understand this with a diagram given below - Scenario 1 Input: List 1 ...
Read MoreHow to check if input is numeric in C++?
Numeric input means a value that contains only digits from 0 to 9, without any letters or special characters. In this article, we'll show you how to write a C++ program to check whether the input is numeric. Let's understand this with a few examples: //Example 1: Input: 12345 Output: Valid numeric input //Example 2: Input: 12a5 Output: Not a numeric input We will cover two common ways to check if the input is numeric or not in C++. Using std::getline with std::isdigit Check Using stringstream to Parse ...
Read MoreC++ Program to Check if a Matrix is Invertible
A matrix is invertible if it has an inverse. An inverse of a matrix exists only when its determinant is non-zero. If the determinant of a matrix is zero, the matrix is called singular and cannot be inverted. In this article, we'll write a C++ program to check if a matrix is invertible using its determinant. To better understand this, let's take the following 3x3 matrix as an example: Given 3*3 Matrix: 4 2 1 2 1 1 9 3 2 To check if this matrix is invertible, we ...
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