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  1. #include <cmath>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.     const auto x = 13;
  8.     auto a = 0.0;
  9.     auto b = 1;
  10.  
  11.     if(x == 1) {
  12.         a = 2.0;
  13.         b = 0;
  14.     } else {
  15.         while((a = pow(x, 1.0 / ++b)) > 2.0) {
  16.             double dummy;
  17.  
  18.             if(modf(a, &dummy) == 0.0) {
  19.                 break;
  20.             }
  21.         }
  22.     }
  23.  
  24.     if(a >= 2.0) {
  25.         cout << a << '^' << b << " = " << x << endl;
  26.     } else {
  27.         cout << "No such a and b exist\n";
  28.     }
  29. }
Success #stdin #stdout 0s 4460KB
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Standard input is empty
stdout
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No such a and b exist
https://ideone.com/gzxkkT
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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