*****Listing 5*****



     typedef ... table;
     #define TABLE_SIZE 500
     table data_1[TABLE_SIZE] = { ... };

     void compute_it(...)
        {
         unsigned short data_1_sum
               = compute_checksum(data_1, sizeof(data_1));

         ...

         proc_1();

         check_checksum("after proc_1: data_1",
                        data_1,sizeof(data_1),
                        data_1_sum);

         ...

         proc_2();

         check_checksum("after proc_2: data_1",
                        data_1,sizeof(data_1),
                        data_1_sum);

         /*
            We are going to now modify data_1
            in a way we know is correct
         */

         modify_table(data_1,...);
         data_1_sum =
              compute_checksum(data_1, sizeof(data_1));

         ...

         proc_3();

         check_checksum("after proc_3: data_1",
                        data_1,sizeof(data_1),
                        data_1_sum);


        }

**********