#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);            }

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