Quick Answer: How Do You Reverse A Number Without A Loop?

What is reverse number?

Reverse the digits to make another 2-digit number.

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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 list?

What’s the best way to reverse the order of a list in Python?Reversing a list in-place with the list. reverse() method.Using the “ [::-1] ” list slicing trick to create a reversed copy.Creating a reverse iterator with the reversed() built-in function.

How do you reverse a number?

Where reverse is a variable representing the reverse of number.Step 1 — Isolate the last digit in number. lastDigit = number % 10. … Step 2 — Append lastDigit to reverse. reverse = (reverse * 10) + lastDigit. … Step 3-Remove last digit from number. number = number / 10. … Iterate this process. while (number > 0)Nov 1, 2016

How do I print numbers in reverse order?

C program to find reverse of a numberint main() { int n, r = 0;printf(“Enter a number to reverse\n”); scanf(“%d”, &n);while (n != 0) { r = r * 10; r = r + n%10; n = n/10; }printf(“Reverse of the number = %d\n”, r);

How do you reverse a 3 digit number in Python?

Reverse a number in Python | Python Program to Reverse a numberINPUT FORMAT: … OUTPUT FORMAT: … SAMPLE INPUT: 321.SAMPLE OUTPUT: 123. … Step 1:Get input from the user.Step 3:Check whether the given number is greater than zero using while loop.Step 5:Multiply rev by 10 and add the remainder to it, store the answer in rev.Step 7:The loop will repeat until the number is reversed.More items…•Mar 9, 2020

How do you reverse a number in python without loop?

try: n = int(input(‘Enter a number : ‘)) reversed = 0 while(n!= 0): r=int(n%10) reversed = reversed*10 + r n=int(n/10) print(reversed) except ValueError: print(‘Given input is not a number. ‘)

Can I find out who a phone number belongs to?

For numbers that are listed in the phonebook, using a reverse phone number service is the easiest way to find out who a telephone number belongs to. The website 411.com offers a free reverse phone number service. Enter the area code and telephone number and press “Search” to return a list of results.

How do you reverse a number in recursion?

Logic to find reverse of number using recursionMultiply reverse variable by 10.Find the last digit of the given number.Add last digit just found to reverse .Divide the original number by 10 to remove last digit, which is not needed anymore.Mar 7, 2016

How do you reverse a negative number?

You can see by multiplying a number by 10 you increase the number of digits by 1 and then add the last digit. For negative numbers, we multiply it by -1 to first make it positive and then apply the same logic, while returning number we just multiply it by -1 again to convert the reversed number into negative.

What does %d mean in Python?

%d is used as a placeholder for numeric or decimal values. For example (for python 3) print (‘%s is %d years old’ % (‘Joe’, 42))

How do I print numbers backwards in Python?

But Python does have a built-in reversed function. If you wrap range() inside reversed() , then you can print the integers in reverse order. range() makes it possible to iterate over a decrementing sequence of numbers, whereas reversed() is generally used to loop over a sequence in reverse order.

How do you reverse a number in a for loop?

Reverse a number using for looppublic class ReverseNumberExample2.{public static void main(String[] args){int number = 123456, reverse = 0;//we have not mentioned the initialization part of the for loop.for( ;number != 0; number=number/10){More items…

How do you reverse a 3 digit number?

How to reverse a 3 digit numberDeclare the int into num1, num2 and num3 along witht the output, reverse.Ask the user to enter a number to reverse.Store the number using scanf.Get the last digit of the number , num1= n/100.Get the middle digit from the user, num2=(num%100)/10.To get the last digit from the user, num3=(num%10)/100.Oct 13, 2017

How does the 1089 trick work?

The mystery is this: first, take any three digit number, where the first and last digits differ by two or more and reverse the number to produce a new one. Then subtract the smaller from the larger producing another new number. If you reverse this number and this time add the two, the result will always be 1089.

How do you reverse a string?

Method 1: Reverse a string by swapping the charactersInput the string from the user.Find the length of the string. The actual length of the string is one less than the number of characters in the string. … Repeat the below steps from i = 0 to the entire length of the string.rev[i] = str[j]Print the reversed string.Mar 11, 2020

When the digits of a two digit number are reversed?

Remark: The difference of a two digit number and its reversed number is exactly divisible by 9 and the quotient obtained is either the difference of the digits of the original 2-digit number or 0. yzx = 100z + 10x + y.