please help with integer values

Hello everyone...
  I'm trying to manipulate by my self the value of an object and when it's a string there is not a problem for example sysName, sysDescr but when I try to get the value for example of the NumInterfaces wich is an integer value I'm not able to get it following the same structure as in a string type, I want to get it because I need to do some mathematical operations with those values...I've tried alot of things but none of them seems to be the correct way and by the way when I try to get the MAC address using this procedure it doesn't work too I'm sure that I'm doing something bad I hope that any of you guys can help me...I just wan to get the value in a variable so I can manipulate it, just that...thank's alot
  /* manipuate the information ourselves */
      for(vars = response->variables; vars; vars = vars->next_variable) {
        int count=1;
        if (vars->type == ASN_OCTET_STR) {
   char *sp = (char *)malloc(1 + vars->val_len);
   memcpy(sp, vars->val.string, vars->val_len);
   sp[vars->val_len] = '\0';
          printf("value #%d is a string: %s\n", count++, sp);
   free(sp)

		
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