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gunner666

help regarding Struct in C | Bytes (1) 3 New Member

Hi ,i want to know wat the : stands for, or does to the program here below

typedef struct ref
{
unsigned int en:1;
unsigned int sm:4;
unsigned int g:8;
unsigned int gate:16;
}
i want to know what does
en:1 really mean,
is it like assignin the variable en wid 1 ,or is it somethin else
plzzzzz reply

Feb 7 '08 #1

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4 help regarding Struct in C | Bytes (2) 1349 help regarding Struct in C | Bytes (3)

gpraghuram

1,275 help regarding Struct in C | Bytes (5) Recognized Expert Top Contributor

Hi ,i want to know wat the : stands for, or does to the program here below

typedef struct ref
{
unsigned int en:1;
unsigned int sm:4;
unsigned int g:8;
unsigned int gate:16;
}
i want to know what does
en:1 really mean,
is it like assignin the variable en wid 1 ,or is it somethin else
plzzzzz reply

It is specifying how many bits you are going to use for storing the value.go through this link to get a good idea abt this

Raghuram

Feb 7 '08 #2

reply

krishnabhargav

24 help regarding Struct in C | Bytes (6) New Member

Hi ,i want to know wat the : stands for, or does to the program here below

typedef struct ref
{
unsigned int en:1;
unsigned int sm:4;
unsigned int g:8;
unsigned int gate:16;
}
i want to know what does
en:1 really mean,
is it like assignin the variable en wid 1 ,or is it somethin else
plzzzzz reply

Those are called Bit Fields...

en is 1 bit, sm is 4 bits and g is 8 bits while gate is 16 bits

refer : http://www.informit.co m/guides/content.aspx?g= cplusplus&seqNu m=131

Feb 7 '08 #3

reply

krishnabhargav

24 help regarding Struct in C | Bytes (7) New Member

Simple example to illustrate bitfields

Expand|Select|Wrap|Line Numbers

  1. #include<iostream>
  2. usingnamespacestd;
  3. typedefstructref
  4. {
  5. unsignedinti:4;
  6. unsignedintj:2;
  7. };
  8. intmain()
  9. {
  10. refr1;
  11. cout<<sizeof(r1)<<endl;
  12. r1.j=3;//sincer1is2bits,maxvalueis"11"(binary)or3
  13. cout<<"Valueofr1.j(2bits)"<<r1.j<<endl;
  14. r1.j=8;//100inbinary,cannotset100,insteadsets00toj'sbits
  15. cout<<"Valueofr1.j(2bits)"<<r1.j<<endl;
  16. }

Feb 7 '08 #4

reply

weaknessforcats

9,208 help regarding Struct in C | Bytes (9) Recognized Expert Moderator Expert

You are using C++ where bit fields are supported as a deprecated feature only to compile relic C code. You are not supposed to use bit fields in new C++ code.

Use a bitset<>:

Expand|Select|Wrap|Line Numbers

  1. bitset<32>bits;//32bits

Feb 7 '08 #5

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