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HTTP/1.1 301 Moved Permanently Server: nginx Date: Tue, 29 Jul 2025 16:16:08 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Location: /reference/cstdlib/malloc/ HTTP/1.1 200 OK Server: nginx Date: Tue, 29 Jul 2025 16:16:09 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive ETag: W/"8098-qZciRFgyN7FQuKZwDALEk17+yQc" Content-Encoding: gzip

TUTORIALS
REFERENCE
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FORUM

C++

Tutorials
Reference
Articles
Forum

Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<cstdlib> (stdlib.h)

functions
- C++11
  _Exit
- abort
- abs
- C++11
  at_quick_exit
- atexit
- atof
- atoi
- atol
- C++11
  atoll
- bsearch
- calloc
- div
- exit
- free
- getenv
- labs
- ldiv
- C++11
  llabs
- C++11
  lldiv
- malloc
- mblen
- mbstowcs
- mbtowc
- qsort
- C++11
  quick_exit
- rand
- realloc
- srand
- strtod
- C++11
  strtof
- strtol
- C++11
  strtold
- C++11
  strtoll
- strtoul
- C++11
  strtoull
- system
- wcstombs
- wctomb
functions (non-standard)
- itoa
types
- div_t
- ldiv_t
- C++11
  lldiv_t
- size_t
macro constants

Reference
<cstdlib>
malloc

function

malloc

void* malloc (size_t size);

Allocate memory block

Allocates a block of size bytes of memory, returning a pointer to the beginning of the block.

The content of the newly allocated block of memory is not initialized, remaining with indeterminate values.

If size is zero, the return value depends on the particular library implementation (it may or may not be a null pointer), but the returned pointer shall not be dereferenced.

Parameters

size: Size of the memory block, in bytes.
size_t is an unsigned integral type.

Return Value

On success, a pointer to the memory block allocated by the function.
The type of this pointer is always void*, which can be cast to the desired type of data pointer in order to be dereferenceable.
If the function failed to allocate the requested block of memory, a null pointer is returned.

Example

/* malloc example: random string generator*/
#include <stdio.h>      /* printf, scanf, NULL */
#include <stdlib.h>     /* malloc, free, rand */
int main ()
{
  int i,n;
  char * buffer;
  printf ("How long do you want the string? ");
  scanf ("%d", &i);
  buffer = (char*) malloc (i+1);
  if (buffer==NULL) exit (1);
  for (n=0; n<i; n++)
    buffer[n]=rand()%26+'a';
  buffer[i]='\0';
  printf ("Random string: %s\n",buffer);
  free (buffer);
  return 0;
}

This program generates a string of the length specified by the user and fills it with alphabetic characters. The possible length of this string is only limited by the amount of memory available to malloc

Data races

Only the storage referenced by the returned pointer is modified. No other storage locations are accessed by the call.
If the function reuses the same unit of storage released by a deallocation function (such as free or realloc), the functions are synchronized in such a way that the deallocation happens entirely before the next allocation.

Exceptions (C++)

No-throw guarantee: this function never throws exceptions.

functions

functions (non-standard)

types

macro constants