difference between these TWO Declerations

[shrichandra]

Hi...
I want to know difference between these two declaration in C language..

register int i;
int _i;

[shrichandra]

difference between these TWO Declerations

Hi...
I want to know difference between these two declaration in C language..

register int i;
int _i;

[Meetee]

Hi...
I want to know difference between these two declaration in C language..

register int i;
int _i;

"register" is keyword used to give a hint to the compiler as to how to generate code. In this case, you are asking the compiler to try to keep a variable in a register instead of in memory. Registers can be accessed much faster than memory locations.

Regards

[dumparun]

"register" is keyword used to give a hint to the compiler as to how to generate code. In this case, you are asking the compiler to try to keep a variable in a register instead of in memory. Registers can be accessed much faster than memory locations.

Regards

Register is only a request to the compiler....
adding register keyword doesnt guarantee, that the variable goes into the register.

Basically used in embedded programing for faster access of the variables

[weaknessforcats]

_i and i are both int variables.

The register suggests to the compiler that ti would be better to keep the variable in a processor register rather than in memory. The compiler is free to ignore the suggestion.

You never use the register keyword unless you really know what you are doing

[Silent1Mezzo]

Also please do not double post.