a c program to computes the prime numbers in the user mentioned range

1#include <stdio.h>
2int main()
3{
4   int num1, num2, flag_var, i, j;
5 
6   /* Ask user to input the from/to range
7    * like 1 to 100, 10 to 1000 etc.
8    */
9   printf("Enter two range(input integer numbers only):");
10   //Store the range in variables using scanf
11   scanf("%d %d", &num1, &num2);
12 
13   //Display prime numbers for input range
14   printf("Prime numbers from %d and %d are:\n", num1, num2);
15   for(i=num1+1; i<num2; ++i)
16   {
17      flag_var=0;
18      for(j=2; j<=i/2; ++j)
19      {
20         if(i%j==0)
21         {
22            flag_var=1;
23            break;
24         }
25      }
26      if(flag_var==0)
27         printf("%d\n",i);
28  }
29  return 0;
30}