Programming Articles - Page 806 of 3363

In this problem, we are given integer values A & B. Our task is to find XOR of two numbers without using the XOR operator.Let's take an example to understand the problem, Input : A = 4, B = 5 Output : 1Solution ApproachOne method to solve the problem is by converting the numbers to their respective binary numbers and then performing bitwise operations based on this table.ABOutput000011101110This will return the result. For this we will use bitwise operations.ExampleProgram to illustrate the working of our solution#include using namespace std; int calcXORwoOperator(int a, int b){    int xorVal = 0; ... Read More

In this problem, we are given integer values n. Our task is to find x, y, z that satisfy 2/nx + 1/y + 1/z.Let's take an example to understand the problem, Input : n = 4 Output : 4, 5, 20Solution ApproachA simple solution to the problem is by finding the solution using the value of n.If n = 1, no solution for the equation.If n > 1, the solution to the equation is x = n, y = n+1, z = n(n+1).The solution is $2/n\:=\:1/n\:+1\:(n+1)\:+\:1/(n^*(n\:+\:1))$ExampleProgram to illustrate the working of our solution#include using namespace std; void findSolution(int a, ... Read More

In this problem, we are given three integer values a, b, and n. Our task is to find x and y satisfying ax + by = n.Let's take an example to understand the problemInput : a = 4, b = 1, n = 5 Output : x = 1, y = 1Solution ApproachA simple solution to the problem is by finding the value between 0 to n that satisfies the equation. We will do this by using altered forms of the equation.x = (n - by)/a y = (n- ax)/bIf we get a value satisfying the equation, we will print ... Read More

fopen() method in C is used to open the specified file.Let’s take an example to understand the problemSyntaxFILE *fopen(filename, mode)The following are valid modes of opening a file using fopen(): ‘r’, ‘w’, ‘a’, ‘r+’, ‘w+’, ‘a+’. For details visit visit C library function - fopen()fopen() for an existing file in write modeIf the file to be opened does not exist in the current directory then a new empty file with write mode is created.If the file to be opened exists in the current directory and is open using ‘w’ / ‘w+’, the contents will be deleted before writing.ExampleProgram to illustrate ... Read More

In this problem, we are given two arrays of integers arr1[] and arr2[] of size m and n. Our task is to find whether an array is subset of another array - Added Method 3.Both arrays arr1[] and arr2[] are unorders and have distinct elements.Let's take an example to understand the problem, Input : arr1[] = {5, 2, 1, 6, 8, 10}, arr2[] = {6, 2, 1} Output : arr2 is a subset of arr1.Solution ApproachTo solve this problem, we have discussed multiple methods here. Let's see the working of each of them with a program.Method 1One method to solve ... Read More

In this problem, we are given an array of integers arr[] and an range. Our task is to find whether a subarray is in the form of a mountain or not.Let's take an example to understand the problem, Input : arr[] = {1, 4, 2, 5, 6, 7, 3, 0}, range = [2, 7] Output : YesExplanation −Subarray of range = {2, 5, 6, 7, 3, 0} The values first increase and then decrease.Solution ApproachA simple solution to the problem is by using extra arrays. We will find the index of the last element which is increasing for each element ... Read More

In this problem, we are given an integer N. Our task is to find whether a given integer is a power of 4 or not.Let's take an example to understand the problem, Input : N = 64 Output : YesExplanation −43 = 64 Solution ApproachA simple solution to the problem is by recursively dividing the number by 4 and checking whether the resultant number is divided by 4 or not. If the value after recursive division becomes 1, return true.ExampleProgram to illustrate the working of our solution#include using namespace std; bool isPowerOf4(int n){ if(n == 0) ... Read More

In this problem, we are given an integer N. Our task is to find whether a given integer is a power of 3 or not.Let's take an example to understand the problem, Input : N = 729 Output : YesExplanation −36 = 719 Solution ApproachA solution to the problem is by checking for the value that is power of 3. We will check if the given number N divides 1162261467 (319). If it is a power of 3, the remainder with be 0 i.e. N will divide it. If it does not, the number is not the power of 3.ExampleProgram ... Read More

In this problem, we are given two values x and y. Our task is to find value of y mod (2 raised to power x).Let's take an example to understand the problem, Input : x = 2, y = 19 Output : 3Explanation −y % 2x = 19 % 22 = 19 % 4 = 3 Solution ApproachA simple solution to the problem is by directly calculating the value of 2x using the pow() function and then finding the value of y % 2x.Another approach to solve the problem is by using log. For the value of y < 2x, ... Read More

Loops in programming are used to compute a block of code multiple times. Here we will be seeing the difference between two types of loops in the program, For Loop and While Loop.For LoopFor Loop is a type of repetition control loop which allows the user to loop over the given block of code upto a specific number of times.Syntaxfor(initisation; condition; update){    …code to be repeated }While LoopWhile loop is a type of entry-controlled loop that allows the user to repeatedly execute the given statement till the given condition is true.Syntaxwhile(condition){    …code to be repeated }Difference between For ... Read More