Fibonacci number

#include<stdio.h>
int main()
{
    int f=0,s=1,i,j,next;
    printf("how many number you want to show : ");
    scanf("%d",&j);
    for(i=0; i<j; i++)
    {
        if(i<=1)
        {
            printf("%d  ",i);
        }
        else
        {
            next=f+s;
            f=s;
            s=next;
            printf("%d  ",next);
        }
    }
    return 0;

}