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## PowerPoint Slideshow about ' Programming' - cheryl

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### Programming

Summary

Exercise – Remove Duplicates

- Download remove_duplicates_ex.c and implement the functionvoid remove_duplicates(Node *head);
- remove_duplicates() accepts a list sorted in ascending order and deletes duplicate nodes from the list, leaving a single node for every value.
- Ideally, the list should only be traversed once.

Clues in the Question

- remove_duplicates does not return a value – what does it mean?
- Why do we care that the list is sorted? Does the sorting order makes a difference?

Solution

void remove_duplicates(Node* head)

{

Node *current = head,

*tmp = NULL;

/* do nothing if the list is empty */

if (current == NULL)

return;

/* Compare current node with next node */

while (current->next != NULL)

{

if (current->data == current->next->data)

{

tmp = current->next;

current->next = current->next->next;

free(tmp);

} else {

/* only advance if no deletion */

current = current->next;

}

}

}

Sample Theoretical Question

- What’s printed on the screen when the following program is run?
- change_val.c
- And what do these function do? What’s missing and how will you fix it?
- secret1.c
- secret2.c

Parentheses Checking

- Implement a function such that –
- Input: string s that contains (among other things) parentheses
- Output: 0 if the parentheses’ nesting is illegal, non-zero otherwise
- For example – (()())() is legal, while ())() and (()(()) are not.
- Write a program that accepts a string from the user and checks the parentheses.

Palindrome

- A palindrome is string that reads the same backward or forward.
- For example: amanaplanacanalpanama (A man, a plan, a canal, Panama!(
- Write a recursive function that checks if a string is a palindrome.
- Write a program that reads a string from the user and checks if it’s a palindrome.

Max Distance

- Write a structure of a point in 2D space and a distance function between two points
- Write a program that gets a series of points from the user and outputs the largest distance between a pair of points
- The number of points is given by the user before the points are read in
- The distance between points [x1, y1] and [x2, y2] is
- Solution – max_distance.c

Max Distance

- Write a structure of a point in 2D space and a distance function between two points
- Write a program that gets a series of points from the user and outputs the largest distance between a pair of points and the points themselves
- The number of points is given by the user before the points are read in
- Solution – max_distance2.c, max_distance3.c

Is In Circle?

- Define two structures – a point and a circle
- Implement a function is_in_circle that accepts a point and a circle, and returns 1 if the point is in the circle, 0 otherwise
- Write a program that accepts n circles from the user and one point, and outputs the number of circles containing that point
- n is user input!

Split List

- Implement a linked list where each item simply contains an integer
- Input a number n from the user, and split the original list into two lists such that the first contains all the elements smaller than n, and the other contains all the others
- Display both linked lists on the screen

Functions To Remember

- stdio.h
- printf, scanf, putchar, getchar
- string.h
- strlen, strcpy, strcat, strcmp, strchr, strstr
- ctype.h
- tolower, toupper, islower, isupper, …
- stdlib.h
- atof, atoi, malloc, free, exit

Solving A Problem

- Read the entire question, beginning to end, then read it again.
- Make sure you understand the requirements.
- Break down the problem into logical steps
- how do I get the input?
- what kind of processing is needed?
- what about the output?
- Write your solution in a clear and concise manner (make sure you cover all your bases)
- “compile and run”

The No. 1 Rule

- Your grader is human, treat him as such!

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