#include<stdio.h>
#define M 10
void main()
{
       int i,a[M+1];
       a[0] =1;a[1]  =2;
       for (i=2;i<=M;++i)
             a[i] =a[i-1] +a[i-2];
      for(i=0;i<m;++i)
             printf("%d,",a[i]);
     printf("%d\n",a[M]);
}
里面的[M+1],a[i],a[i-1]分别是什么意思,请通俗一点,最好有列子