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  1. #include <iostream>
  2. #include <random>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7. 	double a = 0, b = 0, c = 0;
  8.  
  9. 	for( unsigned long long x = 1; x < 100000000000000ULL; x *= 10 )
  10. 	{
  11. 		std::mt19937 generator;
  12. 		std::uniform_real_distribution<double> distribution( 0, 10000.0 / x );
  13. 		unsigned found = 0;
  14. 		for ( unsigned i = 0; i < 10000; ++i )
  15. 		{
  16. 			a = distribution(generator); 
  17. 			b = distribution(generator); 
  18. 			c = distribution(generator); 
  19. 			if ( ( (a + b ) + c ) != ( a + ( b + c ) ) )
  20. 			{
  21. 				++found;
  22. 			}
  23. 		}
  24.  
  25. 		cout << 0 << " : " << ( 10000.0 / x ) << "\t" << found << endl;
  26. 	}
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0.02s 3340KB
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stdin
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Standard input is empty
stdout
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0 : 10000	256
0 : 1000	285
0 : 100	233
0 : 10	160
0 : 1	1
0 : 0.1	280
0 : 0.01	261
0 : 0.001	242
0 : 0.0001	303
0 : 1e-05	252
0 : 1e-06	264
0 : 1e-07	261
0 : 1e-08	271
0 : 1e-09	267
https://ideone.com/P0693R
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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