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March 22, 2010

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What is the difference between realloc() and free()?

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The free subroutine frees a block of memory previously allocated by the malloc subroutine. Undefined results occur if the Pointer parameter is not a valid pointer. If the Pointer parameter is a null value, no action will occur. The realloc subroutine changes the size of the block of memory pointed to by the Pointer parameter to the number of bytes specified by the Size parameter and returns a new pointer to the block. The pointer specified by the Pointer parameter must have been created with the malloc, calloc, or realloc subroutines and not been deallocated with the free or realloc subroutines. Undefined results occur if the Pointer parameter is not a valid pointer.

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C++

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Computer Programmer

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doctor, confident, inside, makes, me, what, is, it, in, that, to, be

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IMU (International Medical School) Malaysia

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Medical school student

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Comments (2) :

dk123

Wednesday, March 19, 2008 6:27 AM

nice comment

thingMaster

Tuesday, October 23, 2007 1:52 PM

you are overconfident. you will probably kill many patients, but drive a nice car.

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503

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How do I eliminate the space around/between my images in html?

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Asked By: Anonymous |

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If your images are inside a table, be sure to set the BORDER, CELLSPACING, and CELLPADDING attributes to 0.
Extra space between images is often created by whitespace around the <IMG> tag in the markup. It is safe to use newlines inside a tag (between attributes), but not between two tags.

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Tuesday, September 18, 2007

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images, html, tag, attribute, eliminate, space around, between, BORDER, CELLSPACING, CELLPADDING

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281

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What are the different storage classes in C?

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C has three types of storage

Variable having block scope and without static specifier have automatic storage duration.

Variables with block scope, and with static specifier have static scope. Global variables (i.e, file scope) with or without the the static specifier also have static scope.

Memory obtained from calls to malloc(), alloc() or realloc() belongs to allocated storage class.

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Tuesday, September 11, 2007

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variable, classes, storage, C, automatic storage, block scope, static scope, allocated storage, malloc(), alloc(), realloc()

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The Juice

Sunday, October 21, 2007 12:07 PM

Actually, C has two storage classes, automatic and static. Register variables have automatic storage and static variables may have internal or extern linkage.

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295

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What is the heap in C ?

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The heap is where malloc(), calloc(), and realloc() get memory.
Getting memory from the heap is much slower than getting it from the stack. On the other hand, the heap is much more flexible than the stack. Memory can be allocated at any time and deallocated in any order. Such memory isn't deallocated automatically; you have to call free().

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Tuesday, September 11, 2007

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stack, HEAP, memory, C, malloc(), realloc(), calloc(), free()

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