Difference Between Malloc vs. Calloc

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Main Difference

The key difference between malloc and calloc is that malloc assigns an only a single block of requested memory whereas calloc assign multiple blocks of requested memory.

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Malloc vs. Calloc

Memory allocation is a very important concept in computer science, in computer programming you need to create a memory for your code. Malloc and calloc need arguments for working. Malloc need only one argument whereas calloc need two arguments. Malloc and calloc are used for C programming, and they are used for memory allocation and de-allocation. Dynamic memory allocation is a most important concept in computer programming. You need to assign memory in the computer before writing a program, that memory is used for the execution.Malloc is a function that is used to assign a block of memory in bytes. The size of the block is decided by the user and to define the size of the memory block is very important before writing the code. The allocation of the memory is given by RAM. So when the program, it request RAM for allocation of memory. When you make a request, and that request is accepted than malloc function is said to be successful and memory is allocated. If malloc function is not able to assign the memory, then NULL returned. The working of malloc function is very similar to a calloc function, as both these function assign memory allocation. Calloc takes two arguments for the request of memory. In calloc we need to assign the size of the data type. The two arugemnts in calloc are separated by commas.

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Comparison Chart

BasisMallocCalloc
Meaningmalloc assign an only single block of requested memorycalloc to assign multiple blocks of requested memory.
SyntaxSyntax of malloc is

void *malloc(size_t size);

Syntax of calloc is

void *calloc(size_t num, size_t size);

SpeedMalloc is faster than callocCalloc is slower than malloc
Initializationthe malloc() doesn’t clear and initialize the allocated memory.The allocated memory is initialized to zero by using calloc().

What is Malloc?

Malloc is a function that is used to assign a block of memory in bytes. The size of the block is decided by the user and to define the size of the memory block is very important before writing the code. The allocation of the memory is given by RAM. So when the program, it request RAM for allocation of memory. When you make a request, and that request is accepted than malloc function is said to be successful and memory is allocated. If malloc function is not able to assign the memory, then NULL is returned.

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What is Calloc?

The working of malloc function is very similar to a calloc function, as both these function assign memory allocation. Calloc takes two arguments for the request of memory. In calloc, we need to assign the size of the data type. The two arugemnts in calloc are separated by commas.

Key Differences

  1. Malloc assign an only a single block of requested memory whereas calloc assign multiple blocks of requested memory.
  2. Syntax of malloc is :void *malloc(size_t size); whereas Syntax of calloc is void *calloc(size_t num, size_t size);
  3. Malloc is faster than calloc whereas Calloc is slower than malloc.
  4. the malloc() doesn’t clear and initialize the allocated memory whereas the allocated memory is initialized to zero by using calloc().

Comparison Video