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functioncalloc<cstdlib>void*calloc(size_tnum,size_tsize);AllocatespaceforarrayinmemoryAllocatesablockofmemoryforanarrayofnumelements,eachofthemsizebyteslong,andinitializesallitsbitstozero.Theeffectiveresultistheallocationofanzero-initializedmemoryblockof(num*size)bytes.ParametersnumNumberofelementstobeallocated.sizeSizeofelements.ReturnValueApointertothememoryblockallocatedbythefunction.Thetypeofthispointerisalwaysvoid*,whichcanbecasttothedesiredtypeofdatapointerinordertobedereferenceable.Ifthefunctionfailedtoallocatetherequestedblockofmemory,aNULLpointerisreturned.Example1234567891011121314151617/*callocexample*/#include<stdio.h>#include<stdlib.h>intmain(){inti,n;int*pData;printf("Amountofnumberstobeentered:");scanf("%d",&i);pData=(int*)calloc(i,sizeof(int));if(pData==NULL)exit(1);for(n=0;n<i;n++){printf("Enternumber#%d:",n);scanf("%d",&pData[n]);}printf("Youhaveentered:");for(n=0;n<i;n++)printf("%d",pData[n]);free(pData);return0;}Thisprogramsimplystoresnumbersandthenprintsthemout.Butthenumberofitemsitstorescanbeadaptedeachtimetheprogramisexecutedbecauseitallocatesasmuchdynamicmemoryasneededduringruntime.
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