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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. bool pPow(int x, int n) {
  5.   int m = (int)pow(x, 1.0/n);
  6.   if (x == pow(m, n))
  7.     return true;
  8. /********************************/
  9.   if (x == pow(m + 1, n))
  10.     return true;
  11. /********************************/
  12.   return false;
  13. }
  14.  
  15. int const y_ulimit = 10;
  16. int const n_ulimit = 10;
  17. int main() {
  18.   /* y^n = x */
  19.   for (int y = 2; y <= y_ulimit; y++) {
  20.     int x = 1;
  21.     for (int n = 1; n <= n_ulimit; n++) {
  22.       x *= y;
  23.       if (!pPow(x, n)) {
  24.         std::cout << "pPow(" << x << "," << n <<") == false!!" << std::endl;
  25.         std::cout << y << "^" << n << ": " << x << std::endl;
  26.       }
  27.     }        
  28.   }        
  29.   return 0;
  30. }
  31. /* end */
  32.  
Success #stdin #stdout 0s 5644KB
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Standard input is empty
stdout
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pPow(-808182895,10) == false!!
9^10: -808182895
pPow(1410065408,10) == false!!
10^10: 1410065408
https://ideone.com/NM2btt
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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