Print All prime number less than 1000 (or Any Range)

 #include <stdio.h>  
 #define N 1000  
 main()  
 {  
   int i,j, arr[N+1];  
   //Set All Array index to 1  
   for(i=2,arr[0]=0;i<N;i++)  
     arr[i]=1;  
   //Now seeting all Non-prime Number to 0  
   for( i = 2; i < N/2; i++)  
   {  
     for ( j = 2; j < N/i ; j++)  
     {  
       arr[i*j] = 0;  
     }  
   }  
   //Printing all Prime numbers  
   for ( i=1; i < N; i++)  
   {  
     if ( arr[i])  
       printf("%d\t",i);  
   }  
   printf("\n");  
 }