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  1. #include <iostream>
  2. #include <math.h>
  3.  
  4. int main()
  5. {
  6.     {
  7.         float a=12345678.0;
  8.         float b=12345679.0;
  9.         float c=1.01233995;
  10.         float p=(a+b+c)/2;
  11.         std::cout << "(float)p-b = " << p-b << "\n";
  12.         float pole=sqrt(p*(p-a)*(p-b)*(p-c));
  13.         std::cout << "(float)Pole = " << pole << "\n";
  14.     }
  15.     {
  16.         double a=12345678.0;
  17.         double b=12345679.0;
  18.         double c=1.01233995;
  19.         double p=(a+b+c)/2;
  20.         std::cout << "(double)p-b = " << p-b << "\n";
  21.         double pole=sqrt(p*(p-a)*(p-b)*(p-c));
  22.         std::cout << "(double)Pole = " << pole << "\n";
  23.     }
  24. }
Success #stdin #stdout 0s 2852KB
comments (?)
stdin 
Standard input is empty
stdout 
(float)p-b = 0
(float)Pole = 0
(double)p-b = 0.00616997
(double)Pole = 972730
https://ideone.com/hY0B0x
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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