C program to find prime no. in a given range

#include <stdio.h>

int main(){
    int num,i,ctr,m,n;

    printf("Input starting number of range: ");
    scanf("%d",&m);

    printf("Input ending number of range : ");
    scanf("%d",&n);
    printf("The prime numbers between %d and %d are : \n",m,n);

    for(num = m;num<=n;num++)
       {
         ctr = 0;

         for(i=2;i<=num/2;i++)
            {
             if(num%i==0){
                 ctr++;
                 break;
             }
        }

         if(ctr==0 && num!= 1)
             printf("%d ",num);
    }
printf("\n");
}