A Kaprekar number is a number whose square when divided into two parts and such that sum of parts is equal to the original number and none of the parts has value 0. (Source : Wiki)
Given a number, the task is to check if it is Kaprekar number or not.
Input : n = 45 Output : Yes Explanation : 452 = 2025 and 20 + 25 is 45 Input : n = 13 Output : No Explanation : 132 = 169. Neither 16 + 9 nor 1 + 69 is equal to 13 Input : n = 297 Output : Yes Explanation: 2972 = 88209 and 88 + 209 is 297 Input : n = 10 Output : No Explanation: 102 = 100. It is not a Kaprekar number even if sum of 100 + 0 is 100. This is because of the condition that none of the parts should have value 0.
- Find square of n and count number of digits in square.
- Split square at different positions and see if sum of two parts in any split becomes equal to n.
Below is implementation of the idea.
Printing first few Kaprekar Numbers using iskaprekar() 1 9 45 55 99 297 703 999 2223 2728 4879 4950 5050 5292 7272 7777 9999
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Improved By : Mithun Kumar