Structures are used to group together different data elements (types of variables) under the same name. These data elements, known as members, can have different types and different lengths.
Take look at the syntax of a structure:
For example you could create a structure “telephone”: which is made up of a char* (that is used to hold the name of the person) and an integer (that is used to hold the telephone number).
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Paint program in c:- This program can draw different shapes using mouse such as line, circle, pixel and many other shapes. You can also change the color, clear the screen. Code of paint program in C is given below:-/. To understand the code see output below the code, it will help you in understanding the code./ C programming code. Other data types Type aliases (typedef / using) A type alias is a different name by which a type can be identified. In C, any valid type can be aliased so that it can be referred to with a different identifier. In C, there are two syntaxes for creating such type aliases: The first, inherited from the C language, uses the typedef keyword.
Take a look at the example:
- From the Google searching I've done, REGS is a part of interrupt handling in the DOS.h file. Well, looking at the modern version of DOS.h, one does not see any REGS definition. Some posts around the Internet said something about it being unique to either the Borland or Turbo compilers, but this code was written to work under many different compilers.
- Jul 05, 2013 union REGS in, out; //REGS is a union. It defines two REGS objects, in and out. You should look at your compiler's documentation before posting questions like this. It is a structure to hold the values of all the 16-bit x86 hardware registers for use in functions that.
Note: the ; behind the last curly bracket.
I am using Dev C v5.6.1 IDE on Windows7. I have written a C code which has hundreds of line that are displayed as output on screen. The buffer size of Console Windows is small and I cannot view the initial printf statements. I tried it changing from 'properties' option, but it didn't help.
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With the declaration of the structure you have created a new type, called telephone. Before you can use the type telephone you have to create a variable of the type telephone. Take a look at the following example:
Note: index is now a variable of the type telephone.
To access the members of the structure telephone, you must use a dot between the structure name and the variable name(variables:name or number.) Take a look at the next example:
Type definitions and structures
Type definitions make it possible to create your own variable types. In the following example we will create a type definition called “intpointer” (a pointer to an integer):
It is also possible to use type definitions with structures. The name of the type definition of a structure is usually in uppercase letters. Take a look at the example:
Note: The word struct is not needed before TELEPHONE index;
Pointer to structures
If you want a pointer to a structure you have to use the -> (infix operator) instead of a dot. Take a look at the following example:
Note: The -> (infix operator) is also used in the cout statement.
Unions
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A union is like a structure in which all members are stored at the same address. Members of a union can only be accessed one at a time. The union data type was invented to prevent memory fragmentation. The union data type prevents fragmentation by creating a standard size for certain data. Just like with structures, the members of unions can be accessed with the . and -> operators. Take a look at the example:
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That’s all for this tutorial. In the next tutorial we take a look classes.
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