fibonacci help??

[aiwasen]

The problem is this. I try to enter the limit of at least 34 fibonacci numbers but the limit display the limit of 89.

#include <iostream>
using namespace std;
int main()
{
    
    int x=0,y=1;
    int num;
    
    cout<<"Enter number:";
    cin>>num;
    cout<<x<<" "<<y;
    
    while(y<=num)
    {
          x= x + y;
          y= y + x;
      
           cout<<" "<<x<<" "<<y;
    }
    
    system("pause");
    
return 0;
}

[Narue]

Your question is confusing, but the "limit" is based on the value of y, not the count of fibonacci numbers you've printed. Perhaps you wanted the latter?

[nmaillet]

It is because of the while(y<=num) statement. When your iteration, where x = 21 and y = 34, is complete: it checks if y is <= num (which it is), so it continues executing. If you changed it to while(y<num) it would stop at 34.

[MareoRaft]

while(y<=num)
    {
          x= x + y;
          y= y + x;
 
           cout<<" "<<x<<" "<<y;
    }

let's say you don't want y to be bigger than 34. Let's say num=34 and y=33. Look at the above code. It sees that y<=num, and runs what is inside the brackets. Inside the brackets, y increases above the number you want, then prints.

perhaps you want something along the lines of

do
    {
          x= x + y;
          y= y + x;
 
           cout<<" "<<x<<" "<<y;
    } while(y<=num)

[aiwasen]

woah I get it I so I added the if conditional value before it prints to y.thanks it means a lot. it was my first program using my own logic,since I'm a newbie ^.^

do
{
    x= x + y;
    
    y= y + x;
 
    cout<<" "<<x<<" ";
    if(y<=num)
    cout<<y;
} 
while(num>y);

int main()
{
  int num =1;
  int a = 0, b = 1;
  int count = 1;

  while (count <= 15-num )
  {
    b = a + b;
    a = b - a;
    b = a + b - a;
    cout<< b<< " ";
    count++;
  }
  cout<<endl;
  return 0;
}