=>FILE HANDLING IN C:
1) STATIC MEMORY ALLOCATION
2) DYANAMIC MEMORY ALLOCATION
BRIF DISCUSS ABOUT POINTS:
> In SMA memory is assign to varible at the starting of the program while in DMA memory is allocated at
the running time of program.
>In SMA memory is fixed in case of DMA memory can be changed.
>In SMA inefficient use of memory while in case of DMA efficient use of memory.
>In DMA memory can be expanded or contracted.So this provide flexibility tn programmer.
=>DYNAMIC MEMORY ALLOCATION FUNCTION:
1) MALLOC( )
2) CALLOC( )
3) FREE( )
4) REALLOC( )
BRIEF DISCUSSION ABOUT POINTS:
1) MALLOC( ):- Function is used to allocate single block of memory.
>If request is granted then it returns a null pointer to the starting of the block.
>If request is not granted then returns a null pointer.
>All the allocated bytes are uninitilized and contain garbage value.
2) CALLOC( ):- Function is used to allocate multiple blocks of memory.
>All the allocated bytes are initilized and not contain garbage value(any value) but contain zero.
3) FREE( ):- Function is used to deallocate the previously allocated memory.
4) REALLOC( ):- Function is used to resize the previously allacted memory.
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