If ur program deals with huge amounts of data, it can be a serious problem.
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// do something
//end without deleting the memory assingned to i
Abstract Memory leak:
1) the os assumes that this block is being used to store something, but actually its of no further use.
2)This block of memory will not be used for any other purpose.
2) After a long time the OS realises, that the memory block is not being used, then it frees it and makes it available as free memory.
There is something called as Garbage Collector which does it periodically.