c语言高手进入

int fn(int n){ if (n==1 or n==2) return 1; else return fn(n-1)+fn(n-2); } void main(){ int n; scanf("%d",&n); printf("the nth number is %d\n",fn(n)); } 2 void main(){ int a[3][3],t; for (int i=0;i<3;i++