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Nov 16th, 2019
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  1. // how to reverse a number:
  2. int n = 123
  3. int m = n
  4. int r = 0
  5.  
  6. while m > 0
  7. r = r * 10 + m % 10
  8. m /= 10
  9.  
  10. // check palindrome:
  11. r == n
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