Skip to main content

Structure and Unions & Memory Allocation

Structure 

Is a data type to store a group of data with various of data type.

Structure Declaration

1. 
struct name_structure {
   dataType1 name_field1;
   dataType2 name_field2;
   …
} name_variable_structure ;

2. 
struct name_structure  name_variable_structure; 

Accessing Structure

Element of a structure can be accessed using dot operator

struct mhs {
  char nim[9];
  char name[26];
  float gpa;
};

int main (){
  struct mhs lia;

  gets(lia.name);
}

Structure Initialization

Syntax:
struct struct_name variable = {value_1, …, value_m};
struct employee info = {1,"B. Smith"};

Array of Structure
Structure data type can only contain one record. But real world problem needs group of records. So it's a structure inside a structure. 

Example:
struct Dob{
  int date, month, year;
};
struct Account {
   int accountNo;
   char accountType;
   char name[31];
   long credit;
   struct Dob lastTrans;
};
//Array of structure
struct Account customer[100];

Union

A union is a special data type available in C that allows to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purpose.

Memory Allocation

Acquiring some memory space (RAM) managed by the OS to be used by the program.


Comments

Post a Comment

Popular posts from this blog

Cloud Storage

Cloud Computing atau nama lainnya adalah Komputasi Awan adalah teknologi yang menjadikan internet sebagai tempat penyimpanan database, aplikasi dan masih banyak lagi. Layanan Cloud Computing 1. Software as a Service (SaaS) Layanan pemakaian teknologi mengenai pemakaian software yang telah disediakan contohnya : gmail, outlook mail 2. Platform as a Service (PaaS) Cloud Computing dapat menyewakan sistem operasi, database engine, framework aplikasi untuk menjalankan aplikasi yang kita buat. Contohnya : windows azure  3. Infrastructure as a Service (IaaS) Cloud Service dapat memberikan layanan infrastruktur IT. Contohnya CPU, penyimpanan data, memory dan lainnya dapat disewa.  Cloud Deployment Model Deployment model define the type of access to the cloud. Type of access : 1. Private cloud       - Single organization only       - Managed by the org or a 3rd party       - On ...
Post a Comment
Read more

Summary Semester 1

Assignment #1  1. Compound Word Jojo has just learned about compound words, which occurs when two or more words are joined to make one longer word. For example the English word footpath, composed of two words "foot" and "path". She wants you to make one such word, given two words that make up the compound word. 2. Birthday Cinema * Jojo, Lili, and Bibi wants to treat their N friends. They want to treat their N friends to watch a movie. Each movie ticket cost 1 point. Luckily there is a promo, if you buy 2 tickets you get 1 for free. How many points do they need to spend to buy tickets for all of them. 3. Counting Number Lili has just learned how to count from 1 to n, while Jojo just recently learned how to use a calculator. When Lili counts from 1 to n, Jojo always adds the numbers that Lili mentions. Jojo asked for your help to check if he used the calculator correctly, he needs you to calculate the number he is supposed to get. 4. Boom...
Post a Comment
Read more

Function and Recursive

Function So, program is divided into modules. The modules in C programming language are execute using function. Function is a group of sentence that does a specific job. Function in C usually written above the int main() The benefit of using Function : 1. A huge program can be divide into smaller modules. 2. Easier to fix if there is a problem. 3. Easier to document Function Construction : return_type_value function_name  (  parameter-list  ) {    statement; } return-value-type :  data type of the value returned,  If not filled, then default data type will be used (integer) If return-value-type is void then the function will not return value Parameter-list : list of value sent from the function initiator (user) example :  int maximum ( int a,int b )    {      statement     } int : return value type of integer int a, int b : the parameter input by user statement : al...
Post a Comment
Read more