Saturday 18 May 2013

Bit feilds in c;how to assign an single bit to an variable in c

C offers the capability to define the width of a variable, but only when the variable
is in a structure called a bit field. For example, you could rewrite the definition of Status
as follows:






struct {
unsigned int bIsValid:1;
unsigned int bIsFullSize:1;
unsigned int bIsColor:1;
unsigned int bIsOpen:1;
unsigned int bIsSquare:1;
unsigned int bIsSoft:1;
unsigned int bIsLong:1;
unsigned int bIsWide:1;
unsigned int bIsBoxed:1;
unsigned int bIsWindowed:1;
} Status;



The :1 that appears after each variable’s name tells the compiler to allocate one
bit to the variable. Thus, the variable can hold only a 0 or a 1. This is exactly what is
needed, however, because the variables are TRUE/FALSE variables. The structure is
only two bytes long.



A bit field can hold more than a single bit. For example, it can hold a definition
of a structure member, such as
unsigned int nThreeBits:3;
In this example, nThreeBits can hold any value from 0 to 7.

Tuesday 14 May 2013

basic types of Modeling transfformations in computer graphics





"simple manipulations of  computer  graphics",,,,,,also  called  different types of basic transformations  that can be applied to any object in an scene