C Reference function malloc()
The function malloc() will allocate a block of memory that is size bytes large. If the requested memory can be allocated a pointer is returned to the beginning of the memory block.
Note: the content of the received block of memory is not initialized.
Usage of malloc():
void * malloc ( size_t size );
Parameters:
Size of the memory block in bytes.
Return value:
If the request is successful then a pointer to the memory block is returned.
If the function failed to allocate the requested block of memory, a null pointer is returned.
Source code example of malloc():
#include<stdio.h>
#include<stdlib.h>
int main ()
{
int * buffer;
buffer = (int*) malloc (10*sizeof(int));
if (buffer==NULL)
{
printf("Error allocating memory!");
exit (1);
}
free (buffer);
return 0;
}
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int x=5;
printf(“%d”,x>>1);
hows it work o/p is 2
writing x>>1 is equivalent in writing x divided by 2 power 1. ie., the use of >> is used to indicate the division by the powers of 2, in the same way << is used to indicate the multiplication by the power of 2
how to create user defined malloc function?, what i mean is how can a user will be able to allocate a specific amount of memory.
very good answer…