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functionfree<cstdlib>voidfree(void*ptr);DeallocatespaceinmemoryAblockofmemorypreviouslyallocatedusingacalltoHYPERLINK"http://www.cplusplus.com/malloc"malloc,HYPERLINK"http://www.cplusplus.com/calloc"callocorHYPERLINK"http://www.cplusplus.com/realloc"reallocisdeallocated,makingitavailableagainforfurtherallocations.Noticethatthisfunctionleavesthevalueofptrunchanged,henceitstillpointstothesame(nowinvalid)location,andnottothenullpointer.ParametersptrPointertoamemoryblockpreviouslyallocatedwithHYPERLINK"http://www.cplusplus.com/malloc"malloc,HYPERLINK"http://www.cplusplus.com/calloc"callocorHYPERLINK"http://www.cplusplus.com/realloc"realloctobedeallocated.Ifanullpointerispassedasargument,noactionoccurs.ReturnValue(none)Example123456789101112/*freeexample*/#include<stdio.h>#include<stdlib.h>intmain(){int*buffer1,*buffer2,*buffer3;buffer1=(int*)malloc(100*sizeof(int));buffer2=(int*)calloc(100,sizeof(int));buffer3=(int*)realloc(buffer2,500*sizeof(int));free(buffer1);free(buffer3);return0;}Thisprogramhasnooutput.Justdemonstratessomewaystoallocateandfreedynamicmemoryusingthecstdlibfunctions.
