2-3.cpp

来自「为C++学习者」· C++ 代码 · 共 17 行

#include<iostream.h>
main()
{
  int n;
  unsigned long fib1=0,fib2=1;
  cout<<"Enter a number:";
  cin>>n;
    //计算第nfibonacci数
  for(int i=2;i<=n;i++)
  {
    long x=fib1;
    fib1=fib2;
    fib2=x+fib1;
  }
  cout<<"fibonacci:"<<fib2<<endl;
  return 0;
}