• Can start with space for just one element allocated and then add on new elements easily without the need to do any copying and reallocation whereas in an array you must allocate memory for certain number of elements.
• Inserting or deleting nodes from a linked list is easy at any place of the linked list.

When it comes to pointers, the const keyword can be in different spots depending on whether you want the pointer to be constant or the location that it points to to be constant.
ex. const char *str;
or
int *const p = &n;

The second example indicates that p points to the variable n, and cannot point anywhere else.

Here’s an example taken from http://www.faqs.org/docs/learnc/x658.html

int
main()
{
int i;
char c;
void *the_data;

i = 6;
c = ‘a’;

the_data = &i;
printf(“the_data points to the integer value %d\n”, *(int*) the_data);

the_data = &c;
printf(“the_data now points to the character %c\n”, *(char*) the_data);

return 0;
}

• Speeds creation/initialization time
• Saves memory by not creating things until they are needed

Example
int a = 2;
int b = 4;

if (b<1 && (a = a + 3))
printf("Z\n");
printf("%d, a);

This program will output 2. As b< 1 is false the whole condition's result is known, the second part of the evaluation (a = a + 3) therefore never gets executed.

Functions

• void clrscr(void)- clears the screen and leaves the cursor in the upper left-hand corner.
• void gotoxy(int x, int y) – moves the cursor to the column number x and row number y.
• int putch(int c)- displays character c at current cursor position and advances 1 position.
• int cputs(char *s) – displays string s, starting at current cursor position and advances as each character is displayed.
• int getch(void) – returns a key code for next key pressed. If the key is a standard ASCII key then ASCII code is returned, otherwise the function returns 0.
• void gettextinfo(struct text_info *r)- fills the struct point to by r with information from screen.