运行下面程序，printf输出显示x=__________________.#include fun(int b[ ], int n){ int i, r=0; for(i=0; i<=n; i++) r=r+b[i];return r;}int main(){ int x, a[]={ 2,3,4,5,6,7,8,9}; x=fun(a, 5); printf("x=%d",x); return 0;}