Fibonacci Roots program in C

Fibonacci Roots program in C
Code:
  #include<stdio.h>
int main(){
  int a=0,b=1,c=0,n;
  scanf("%d",&n);
  while(1){
    c=a+b;
    if(c>=n)
      goto END;
    a=b;
    b=c;
  }
  END: printf("%d %d",a,b);
  return 0;
}