CODEWITHSUNDEEP
c++doublefloating-accuracybuffer-overflow
Finlay Lifny
Finlay Lifny

Reputation: 43

Largest floating point variable

The program takes for parameter one double and its doing computation with long float point values. eg double myvar= n*0.000005478554 /298477. The problem is that im not sure that the real computational value is inserted to myvar. because whenvever i change n it produce the same thing cout<<"myvar ="<<myvar; What is the biggest type in c++ that can be used for maximum accuracy? Does a buffer overflow caused by this code because double variable cant hold too much info ? If yes what can happen and how can i detect it for later use?

Upvotes: 0

Views: 5001

Answers (1)

MSalters
MSalters

Reputation: 179809

double will hold values much smaller (and bigger) than 0.000005478554 /298477. Any problem that you have is almost certainly caused by a bug in your code. Show it!

Try to reduce your problem to a few lines. This kind of problems can be reproduced with something as small as 

#include <iostream>
int main() {
  double myvar = 7 * 0.000005478554 /298477;
  std::cout << myvar;
}

Upvotes: 3

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