text: #include <stdio.h>
  #include <stdlib.h>
  
  
  int fib(n){
    if(n == 0) return  0; else if (n == 1) return 1;
    else return (fib(n-1)+fib(n-2));
  }
  int main(void){
    printf("output = %d\n",fib(10));
    return 0;
  }
  