#include<stdio.h>
void trade (a,b,c)
{
b=c;
a=b;
}
main()
{
int n,i,fbn,fbn1,fbn2;
printf("please input the month which you want to know:");
scanf("%d\n",&n);
if(n>13 || n<1)
printf("error due to the wrong input !\n");
else if(n==1|| n==2)
        printf("the total number of the rabbits are 1.\n");
        else
        fbn1=fbn2=1;
            for(i=3;i<=n;i++)
            {
         fbn=fbn1+fbn2;
                  fbn2=fbn1;
      fbn1=fbn;
            }
            printf("the final number of the rabbits is :%d",fbn);
          
}

评论