Turn off the light problem

#include <stdio.h>#include<string.h>#defineMAX 1000+10int_light[max];intMain () {intLight =0, _alllight =0, i =0, j =0, _preson =0, Firstpreson =1; memset (_light,0,sizeof(_light)); printf ("Please enter the all light and Preson:"); scanf ("%d%d", &_alllight, &_preson);  for(i =1; I <= _preson; i++)         for(j =1; J <= _alllight; J + +)        if(j%i = =0) _light[j] =!_light[j];//the use of switching lights is 0 and 1 of the characteristics of the array subscript is the position of the lamp     for(i =0; I <= _alllight; i++)    {        if(_light[i]) {if(Firstpreson) Firstpreson=0; Elseprintf (" "); printf ("%d", i); }} printf ("\ n"); return 0;}

Turn off the light problem