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  1. #include <iostream>
  2. #include <limits.h>
  3. using namespace std;
  4.  
  5. int reverse(int x) {
  6.     //to accomodate overflowed reversed value if occured
  7.     long revX = 0;
  8.     while (x != 0) {
  9.         revX = revX * 10 + x % 10;
  10.         //overflow check
  11.         if (revX > INT_MAX || revX < INT_MIN) {
  12.             return 0;
  13.         }
  14.         x /= 10;
  15.     }
  16.     return (int) revX;
  17. }
  18.  
  19. int main() {
  20. 	int x = -321;
  21. 	cout << reverse(x);
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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-123
https://ideone.com/3RwjWu
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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