View Code of Problem 23

#include <stdio.h>
#include <string.h> 
int main (void)
{
	int n,i;
	while(scanf("%d",&n)!=EOF&&n!=0){
		int a[n];
		a[0]=1;a[1]=2;
		if(n>2){
			for(i=2;i<n;i++){
			a[i]=a[i-1]+a[i-2];
			}
		}
		printf("%d\n",a[n-1]);
	}
	return 0;
}