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  1. #include <cmath>
  2. #include <iostream>
  3. #include <limits>
  4.  
  5. int main()
  6. {
  7.   std::cout.precision(std::numeric_limits<float>::digits10);
  8.   double PIf = acos(-1.0F);
  9.   std::cout << "PIf " << sizeof(float) << " :  " << PIf << std::endl;
  10.  
  11.   std::cout.precision(std::numeric_limits<double>::digits10);
  12.   double PId = acos(-1.0);
  13.   std::cout << "PId " << sizeof(double) << " :  " << PId << std::endl;
  14.  
  15.   std::cout.precision(std::numeric_limits<long double>::digits10);
  16.   long double PIl = std::acos(-1.0L);
  17.   std::cout << "PIl " << sizeof(long double)  << " : " << PIl << std::endl;
  18. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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PIf 4 :  3.14159
PId 8 :  3.14159265358979
PIl 12 : 3.14159265358979324
https://ideone.com/dRkqTe
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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