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how to access structures

 
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pic_man



Joined: 24 Feb 2016
Posts: 1

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how to access structures
PostPosted: Wed Feb 24, 2016 3:19 am     Reply with quote
hi everyone
I am using ccs compiler version 4.124
I was seeing the example file rtctimer.c
In this example file structures are used.and to access elements of those structures "->" symbol is used like
Code:

unixTime += timeT->tm_sec;


we can also use it as this way
Code:

unixTime += timeT.tm_sec;


what is the difference between both?
From where i can read and study about supported syntax in ccs?
Ttelmah



Joined: 11 Mar 2010
Posts: 19551

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PostPosted: Wed Feb 24, 2016 3:51 am     Reply with quote
Read a C textbook!...

-> is used as a shorthand when dealing with a pointer to a structure.

If 'p' is a pointer to a structure, then p->member accesses the member in the structure being pointed to.

The -> is used inside a function, where timeT has been passed as a pointer.
It's a shorthand for (*timeT).member
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