Using a static variable in generating the Fibonacci sequence. - C++ Function

C++ examples for Function:static variable

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Description

Using a static variable in generating the Fibonacci sequence.

Demo Code

#include <iostream>
#include <iomanip>

long next_Fibonacci();

int main()/*from w ww .  j a  va2  s . c  om*/
{
  int count {};
  std::cout << "Enter the number of Fibonacci values to be generated: ";
  std::cin >>count;
  std::cout << "The Fibonacci  Series:\n";
  for (int i {} ; i < count ; ++i)
  {
    std::cout << std::setw(10) << next_Fibonacci();
    if (!((i + 1) % 8))                     // After every 8th output...
      std::cout << std::endl;               // ...start a new  line
  }
  std::cout << std::endl;
}

// Generate the next number in the Fibonacci series
long next_Fibonacci()
{
  static long last;                         // Last number in sequence
  static long last_but_one {1L};            // Last but one in sequence

  long next {last + last_but_one};          // Next is sum of the last two
  last_but_one = last;                      // Update last but one
  last = next;                              // Last is new one
  return last;                              // Return the new value
}

Result


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