Algorithm & Programming (Array and Pointer)

Algorithm & Programming (Array and Pointer)

Pointer

Pointer is variable that store address of another variable.
Pointer which is mostly used : *(content of) and &(address of).

Example:

int i, *ptr;

ptr = &i;

To assign a new value to the variable pointed by the pointer:

*ptr = 5;  /* means i=5 */ 

Pointer to pointer is pointer for address to another pointer.

Pointer constant : a pointer that can be assigned with new value at run-time. Array is pointer constant.
Pointer variable : a pointer that can not be assigned with new value at run-time.

Array

Array is data saved to be access as a group or individually.
Characteristic:
1. Homogenous = all element have similar data type.
2.Random access = doesn't have to be sequential.

Array Initialization
Example : B[4]={1,2,5,}

One Dimensional Array

Syntax: type array_value [value_dim];

Example : int number[10000];

Two Dimensional Array

Syntax : type name_array[row][col];

Example: int number[7][7];

References

Paul Deitel & Harvey Deitel. (2016). C how to program : with an introduction to C++. 08. Pearson Education. Hoboken. ISBN: 9780133976892. Chapter 6 & 7

C Programming – Pointers: http://www.exforsys.com/tutorials/c-language/c-pointers.html

Storing Similar Data Items: http://aelinik.free.fr/c/ch12.htm

Name : Samuel Xavier Widjaja
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