1

2

3

4

REQUIREMENT
A natural number n is read. Print the number obtained by reversing the positions of its digits.

Example. If we read n=248, we print 842.

SOLUTION
Consider two numbers: the second number is obtained from the first by adding a digit at the end (456 and 4563). We have the relationship:

4563 = 456 * 10 + 3

Obviously, the relationship holds true for any two natural numbers that satisfy the above condition. It's clear that the reversed number will start with the last digit of the number read. Let's assume we read 248. We'll build the reversed number like this:

8=0*10+8
(8 is the last digit of the read number and the remaining number is 24)
84=8*10+4
(4 is the last digit of the remaining number and the remaining number is 2)
842=84*10+2
(2 is the last digit of the number 2 and the remaining number is 0)

Review the resulting program:

double_arrow Execute  hourglass_top Execute

clear    cached    undo    redo

Console / Output

done

error_outline

clear

Mind the syntax!

1

2

3

4

home

list  CONTENTS

perm_identity

arrow_upward