Question

what is the difference between new and malloc in c. when to use new and when to use malloc??

Answer 1

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Answer 2

new is not in c .It is in c++.
malloc:
memory allocation for a pointer.It is run time allocation.
The function malloc is used to allocate a certain amount of memory during the execution of a program. The malloc function will request a block of memory from the heap. If the request is granted, the operating system will reserve the requested amount of memory.
example:

#include<stdio.h>

int main()
{
int *ptr_one;

ptr_one = (int *)malloc(sizeof(int));

if (ptr_one == 0)
{
printf("ERROR: Out of memory\n");
return 1;
}

*ptr_one = 25;
printf("%d\n", *ptr_one);

free(ptr_one);

return 0;
}

Answer 3

New is a operator where as Malloc is a function.Malloc we need to specify the size of memory for our data types. But in case of New we do not need to specify the size.
malloc return void* by default ,we need to typecast pointer returned from malloc but in case of new there is no need to typecast ex: int *a; a=(int*)malloc(sizeof(int)); a= new int;