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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4.  
  5. using namespace std;
  6.  
  7. pair<double, int> normalize(double x)
  8. {
  9.     double zero = 0.0;
  10. 	double ten = 10.0;
  11. 	double one = 1.0;
  12. 	pair<double, int> normal {x, 0};
  13.  
  14. 	if ( abs(x) > zero && abs(x) < one ) {
  15. 		while ( abs(x *= ten) < ten )
  16. 			--normal.second;
  17. 		normal.first = x / ten;
  18. 	}
  19. 	else {
  20. 		while ( abs(x) >= ten ) {
  21. 			x /= ten;
  22. 			++normal.second;
  23. 		}
  24. 		normal.first = x;
  25. 	}
  26.  
  27. 	return normal;
  28. }
  29.  
  30. int main()
  31. {
  32. 	double x; cin >> x;
  33. 	auto norm = normalize(x);
  34. 	showpos(cout);
  35.  
  36. 	cout << fixed << setprecision(10) << norm.first << 'e' << norm.second << endl;
  37. 	cout << scientific << x;
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 3032KB
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stdin
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-99999952.46
stdout
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-9.9999952460e+7
-9.9999952460e+07
https://ideone.com/tUkZy0
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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