Hollow Square of Asterisks

Similar to Square of Asterisk except it print a hollow square out of asterisk with respect to the side being reads.

/*
   title: hollowSquareOfAsterisk
   author: aeriqusyairi
   date: dec27 2011
*/

#include<stdio.h>
#include<stdlib.h>

int main(){
   int side=0,c1=1,c2=1,c3=0;
   printf("Input the side of your square: ");
   scanf("%d", &side);
   for(c1=1;c1 <= side;c1++){
      if(c1 == 1 || c1 == side){
         for(c2=1;c2 <= side;c2++){
            printf("*");              
         }
         printf("\n");
      }else{
         for(c2=1;c2 <= side;c2++){
            if(c2 == 1 || c2 == side)
               printf("*");
            else{
               printf(" ");     
            }              
         }
         printf("\n");       
      }
   }    
   system("pause");
   return 0;
}