Fibbonacci series : C Program

/* Fibbonacci series */

#include<stdio.h>
#include<conio.h>

void main()
{
 int len,i,a=0,b=1,c=1;
 clrscr();
 printf("Enter length for fibbo series : ");
 scanf("%d",&len);
 printf("\n1 ");
 for(i=1;i<len;i++)
 {
  printf("%d ",c);
  a=b;
  b=c;
  c=a+b;
 }
 getch();
}

Output :