# What is pointer write program to swap values of two variables by passing pointers?

## What is pointer write program to swap values of two variables by passing pointers?

Explanation : Swapping Two Variables using Pointer scanf(“%d”, &num1); printf(“\nEnter the Second number : “); scanf(“%d”, &num2); Now You need to pass the address of both variables to the function.

## How do you swap two variables?

The bitwise XOR operator can be used to swap two variables. The XOR of two numbers x and y returns a number that has all the bits as 1 wherever bits of x and y differ. For example, XOR of 10 (In Binary 1010) and 5 (In Binary 0101) is 1111 and XOR of 7 (0111) and 5 (0101) is (0010).

How do you swap two arrays using pointers?

The logic is same for same or different length of arrays. Input array elements in two arrays say sourceArray and destArray . Initialize a pointer to both arrays say *sourceArr = sourceArray and *destArr = destArray . Initialize two more pointers that keeps track of both array last memory address.

How do you swap two arrays?

Write a c program for swapping of two arrays

1. #include
2. int main() {
3. int a,b,c,i;
4. printf(“Enter First array->”);
5. for (i=0;i<10;i++)
6. scanf(“%d”,&a[i]);
7. printf(“\nEnter Second array->”);
8. for (i=0;i<10;i++)

### How do you swap an array?

The swap function works by taking three arguments:

1. The array.
2. The first item whose contents you want to swap.
3. The second item whose contents you want to swap.

### How do you swap an Arraylist?

How to swap two elements in ArrayList in Java

1. Swap two elements in arraylist – Collections. swap() Collections. swap() method swaps the elements at the specified positions in the specified list.
2. Swap two elements in arraylist example. Java program to swap two specified elements in a given list. In this example, we are swapping the elements at position ‘1’ and ‘2’.

How do you swap positions in arrays?

How to move an element of an array to a specific position (swap)?

1. Create a temp variable and assign the value of the original position to it.
2. Now, assign the value in the new position to original position.
3. Finally, assign the value in the temp to the new position.

How do you swap arrays in C++?

The C++ function std::array::swaps() swap contents of the array. This method takes other array as parameter and exchage contents of the both arrays in linear fashion by performing swap operation on induvisual element of array.

## What is C++ exchange function?

This program uses a function called exchange(int*,int*) that takes two argument as integer pointers. The variables are passed by reference method and hence, the swapping done at the exchange function will reflect in the main method also.

## How do you reverse an array in C++?

1. #include #include
2. using namespace std;
3. // Utility function to print contents of an array. void print(int arr[], int n)
4. { for (int i = 0; i < n; i++) {
5. cout << arr[i] << ” “; }
6. }
7. // Utility function to reverse elements of an array. void reverse(int arr[], int n)
8. {

How do you swap arrays in Java?

Example 2

1. import java.util.*;
2. public class CollectionsSwapExample2 {
3. public static void main (String[] args) {
4. //Create a list with items.
5. List list = Arrays.asList(44, 55, 99, 77, 88, 66);
6. System.out.println(“List before swapping: “+list);
7. Collections.swap(list, 2, 5);

Is swap a keyword in Java?

The swap() method of java. util. Collections class is used to swap the elements at the specified positions in the specified list. If the specified positions are equal, invoking this method leaves the list unchanged.

### How do you swap two variables in Java?

Below are the simple steps we follow:

1. Assign x to a temp variable : temp = x.
2. Assign y to x : x = y.
3. Asign temp to y : y = temp.

### How do you reverse an array?

Solution Steps

1. Place the two pointers (let start and end ) at the start and end of the array.
2. Swap arr[start] and arr[end]
3. Increment start and decrement end with 1.
4. If start reached to the value length/2 or start ≥ end , then terminate otherwise repeat from step 2.

How do you reverse an array pointer?

Below is the step by step descriptive logic to reverse array using pointers.

1. Input size and array elements, store it in some variable say size and arr .
2. Initialize a pointer to first element of array say * left = arr .
3. Initialize another pointer to last element of array say * right = (arr + size – 1) .

How do you reverse an array without using another array?

Steps to reverse an array without using another array in C: Set i=0 to point to the first element and j=length-1 to point to the last element of the array. Run while loop with the condition ith and jth element in the array. Increment i and decrement j .

## What is reversal algorithm?

The reverse algorithm allows to key in a number on a calculated data block and save a value, derived through a reverse formula to a specified InfoCube.

## What is array order reversal?

The JavaScript array reverse() method changes the sequence of elements of the given array and returns the reverse sequence. In other words, the arrays last element becomes first and the first element becomes the last. This method also made the changes in the original array.

How do you reverse an array in a for loop C++?

Algorithm to reverse an array

1. First of all take number of elements as input from user. Let it be N.
2. Then ask user to enter N numbers and store it in an array(lets call it inputArray).
3. Declare another array of size equal to input array.
4. Using a for loop, copy elements from inputArray to reverseArray in reverse order.

How do you reverse in C++?

Let’s see the simple example to reverse the given string:

1. #include
2. #include
3. #include
4. using namespace std;
5. int main() {
6. string str = “Hello Myself Nikita”;
7. cout << “Before Reverse : “<< str << endl;
8. reverse(str. begin(), str. end());

### Is C++ a palindrome?

Palindrome program in C++ A palindrome number is a number that is same after reverse. For example 121, 34543, 343, 131, 48984 are the palindrome numbers.

### Which function is used to reverse the string?

strrev

How do I reverse a string without Strrev?

String reversal without strrev function

1. int main() { char s, r; int begin, end, count = 0;
2. printf(“Input a string\n”); gets(s);
3. while (s[count] != ‘\0’) count++;
4. end = count – 1;
5. for (begin = 0; begin < count; begin++) { r[begin] = s[end]; end–; }
6. r[begin] = ‘\0’;
7. printf(“%s\n”, r);
8. return 0; }

How do I reverse a string pointer?

Reverse a string using pointers in C

1. #include
2. int string_length(char*);
3. void reverse(char*);
4. main()
5. {
6. char string;
7. printf(“Enter a string\n”);
8. gets(string);

## How can you reverse a string?

Method 1: Reverse a string by swapping the characters

1. Input the string from the user.
2. Find the length of the string. The actual length of the string is one less than the number of characters in the string.
3. Repeat the below steps from i = 0 to the entire length of the string.
4. rev[i] = str[j]
5. Print the reversed string.

## How do you reverse a string?

JAVA

1. public class Reverse.
2. {
3. public static void main(String[] args) {
4. String string = “Dream big”;
5. //Stores the reverse of given string.
6. String reversedStr = “”;
7. //Iterate through the string from last and add each character to variable reversedStr.
8. for(int i = string.length()-1; i >= 0; i–){

Why the string is immutable?

The String is immutable in Java because of the security, synchronization and concurrency, caching, and class loading. The reason of making string final is to destroy the immutability and to not allow others to extend it. The String objects are cached in the String pool, and it makes the String immutable.

What does reverse () do in Python?

reverse() is an inbuilt method in Python programming language that reverses objects of list in place. Returns: The reverse() method does not return any value but reverse the given object from the list.

### How do you reverse a number?

Where reverse is a variable representing the reverse of number.

1. Step 1 — Isolate the last digit in number. lastDigit = number % 10.
2. Step 2 — Append lastDigit to reverse. reverse = (reverse * 10) + lastDigit.
3. Step 3-Remove last digit from number. number = number / 10.
4. Iterate this process. while (number > 0)

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