1. TUTORIAL 8
CS 137 F18
November 5th

2. Overview a5 Common Mistakes a6 Progress? a7 Hints String Review
isSubstring.c
isValid.c

3. a5 Common Mistakes a5p1: cribbage.c a5p2: poker.c a5p3: event.c
Nobs and same suit
Sorting all 5 cards
a5p2: poker.c
Royal Flush and checking suits
Ordering of Rules
a5p3: event.c
Very Well Done
No need to sort

4. a6 Progress? Questions? a6p1: euclidean_algorithm.c a6p2: run.c
Think about private cases
a6p2: run.c
Dealing with more than 2 digits
a6p3: merge.c
Sort immediately

5. a7 Hints Questions? MUST remove main function (comment or delete)
Strings are constant (string literal); do not mutate s; use heap
Test for empty string and NULL as requested
a7p1: reverse.c
simple; do not overthink
a7p2: num_duplicates.c
Utilize given macro
a7p3: largest_square.c
Understand what is asked
Use strncmp

6. string.h
Contains:
size_t type
NULL macro
string functions (strlen, strcmp, strcat)
memory functions (memset, memcpy, memcmp)
Always care with NULL pointer!
strlen
see string.c

7. isSubstring.c
a string t is a substring of string s if and only if string t is completely contained within string s
all characters in t appear in order and adjacent to one another in s
create the function isSubstring that returns whether a given string t is a substring of a given string s
Assume that s and t are non-empty and non-null
bool isSubstring(const char *s, const char *t);

8. isValid.c
Create a C function bool isValid(char *username, char *pword) that takes in a username (max length 8) and a possible password as strings and returns whether that password is valid. If invalid, print out all the messages saying why it was invalid.
Assume username is valid
Assume password contains standard keyboard input
A valid password must:
be length at least 8 characters
not contain the same character twice in a row
contain a lower and upper case letter
contain a number and a special character
not contain any whitespace characters
not contain the username as a substring