Lucas number Program

Lucas numbers: It is similar to Fibonacci numbers, each Lucas number is defined to be the sum of its two immediate previous terms Where as the first two number are 2 and 1.

The Lucas numbers are as following :

2 1 3 4 7 11 18 29 47 76

#include<stdio.h>

#include<conio.h>

int main()

{

 int x,y,z,num;

 printf("Enter the limit of Lucas number : ");

 scanf("%d",&num);

 x=2;

 y=1;

 while(num>=x)

 {

   printf(" %d",x);

   z=x+y;

   x=y;

   y=z;

 }

 getch();

 return 0;

}

Output;

Enter the limit of Lucas number : 125

 2 1 3 7 11 18 29 47 76 123