Computational Physics
Weeks 5/6 Course work

Comments and questions to John Rowe.

This is two week's work and may be handed in as a single piece of work.

1. Take the skeleton address-book program from the "functions" notes and do enough to make it compile but not do anything, (ie #define some constants in a header file and write some dummy functions that do nothing but print "You've called this function". You will need to put the function prototypes in the header file).

2. Now write the get_user_command function, making sure either thaat it only returns valid values or that main() handles invalid values correctly..

3. Decide on a suitable structure for a phone-book entry and define it, together with a next member, in the header file.

4. Now add the add_new_phonebook_entry function basing it on the newcoord function from today's notes. (NB, you will need to declare a pointer in main to act as the start of the list - don't forget to initialise it to NULL!).

5. Now add a simplified version of lookup_phonebook_entry which just goes through the whole linked list printing out every entry.

6. The function strstr(haystack, needle) (where both haystack and needle are strings) returns non-zero when the first string contains the second, eg strstr("Football", "ball") is true but strstr("Football", "Leeds Utd.") is false.

   Modify your lookup_phonebook_entry function to read in a search string and just print out the entries that match. (You will need to #include <string.h>).

   Is strstr case-sensitive?
   • What happens if the search string is blank (ie you just hit <return>)?