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malloc

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Smoggy Sloth answered on March 3, 2020 Popularity 9/10 Helpfulness 2/10

answer malloc

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malloc

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/*
 *Dynamic memory creation using malloc
 *Language: C
 */

#include<stdio.h>
//To use malloc function in our program
#include<stdlib.h>

int main()
{
    int *ptr;

    //allocating memory for 1 integer
    ptr = malloc(sizeof(int));

    if(ptr != NULL)
           printf("Memory created successfully\n");

    return 0;
}

Popularity 9/10 Helpfulness 2/10 Language c

Source: www.log2base2.com

Tags: c malloc

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Contributed on Jul 22 2022

Smoggy Sloth

0 Answers Avg Quality 2/10

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malloc in c

Comment

#include <stdlib.h>

void *malloc(size_t size);

void exemple(void)
{
  char *string;
  
  string = malloc(sizeof(char) * 5);
  if (string == NULL)
    return;
  string[0] = 'H';
  string[1] = 'e';
  string[2] = 'y';
  string[3] = '!';
  string[4] = '\0';
  printf("%s\n", string);
  free(string);
}

/// output : "Hey!"

Popularity 10/10 Helpfulness 4/10 Language c

Source: Grepper

Tags: c

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Contributed on Mar 03 2020

Thurger

0 Answers Avg Quality 2/10

malloc basics

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// Program to calculate the sum of n numbers entered by the user

#include <stdio.h>
#include <stdlib.h>

int main() {
  int n, i, *ptr, sum = 0;

  printf("Enter number of elements: ");
  scanf("%d", &n);

  ptr = (int*) malloc(n * sizeof(int));
 
  // if memory cannot be allocated
  if(ptr == NULL) {
    printf("Error! memory not allocated.");
    exit(0);
  }

  printf("Enter elements: ");
  for(i = 0; i < n; ++i) {
    scanf("%d", ptr + i);
    sum += *(ptr + i);
  }

  printf("Sum = %d", sum);
  
  // deallocating the memory
  free(ptr);

  return 0;
}

Popularity 10/10 Helpfulness 3/10 Language c

Source: www.programiz.com

Tags: c

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Contributed on Feb 03 2022

Talented Tiger

0 Answers Avg Quality 2/10

malloc c

Comment

int *out;

out = malloc(sizeof (int) * length);
if (!out)
{
	return (NULL);
}

Popularity 9/10 Helpfulness 3/10 Language cpp

Source: Grepper

Tags: c c++ c+

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Contributed on Jul 19 2023

unel

0 Answers Avg Quality 2/10

malloc in c

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// Let's allocate enough space on the heap for an array storing 4 ints

intArray = (int *) malloc(4 * sizeof(int)); // A pointer to an array of ints

intArray[0] = 10;
intArray[1] = 20;
intArray[2] = 25;
intArray[3] = 35;

Popularity 10/10 Helpfulness 3/10 Language c

Source: Grepper

Tags: c

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Contributed on Jun 15 2021

Doubtful Deer

0 Answers Avg Quality 2/10

C malloc

Comment

Example: ptr = (int *) malloc (50)

Popularity 10/10 Helpfulness 3/10 Language c

Source: www.guru99.com

Tags: c

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Contributed on Aug 28 2021

Dead Duck

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what does malloc do

Comment

adds specified amount of memory but there could be more writable memory ahead, so you have to decide how much you access

Popularity 10/10 Helpfulness 3/10 Language whatever

Source: Grepper

Tags: malloc ma

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Contributed on Sep 22 2022

AB_498

0 Answers Avg Quality 2/10

malloc c

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int main(int argc, char *argv[])
{
    int* memoireAllouee = NULL;

    memoireAllouee = malloc(sizeof(int));
    if (memoireAllouee == NULL) // Si l'allocation a échoué
    {
        exit(0); // On arrête immédiatement le programme
    }

    // On peut continuer le programme normalement sinon

    return 0;
}

Popularity 10/10 Helpfulness 3/10 Language c

Source: openclassrooms.com

Tags: c

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Contributed on Nov 13 2020

Frightened Flamingo

0 Answers Avg Quality 2/10

malloc

Comment

// if you initialize a pointer and want to use it like an array, 
// you have to claim the space you use, 
// that is what the memory-allocation-funtion (malloc) does;

// exaple for that: str(0) belongs to you, but str(1), str(2), ... do not
// if you do not use the malloc funtion; 
// you can access it, but it could be used by another programm;

#include <stdio.h>
#include <stdlib.h>

void func(void)
{
    char *str = malloc(sizeof(char) * 5); // sizeof --> char needs 
    // a specific space per value saved;
    // *5 --> 5 is the number of values in the array;

    char *str1 = malloc( 5 * sizeof *str1 );//      |
    char *str2 = malloc( sizeof(char[5]) );//       | other syntaxes

    if(str == NULL) { exit(1); } // malloc returns NULL 
    // if it could not allocate the memory;
    str[0] = 'H';
    *(str+1) = 'e';	// used like pointer
    str[2] = 'y';	// used like array
    *(str+3) = '!';
    str[4] = '\0';

    printf("%s\n", str);

    free(str); // frees the memory allocated to str;
    // if you free the memory too early and try to access str later
    // that is called a memory leak;
}

int main(void)
{
    func();
    return 0;
}

// shell: Hey!

// improved version of Thurger's

Popularity 10/10 Helpfulness 2/10 Language c

Source: Grepper

Tags: c

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Contributed on Feb 08 2022

DannyTheTiger

0 Answers Avg Quality 2/10

C malloc

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#include <stdlib.h>
int main(){
int *ptr;
ptr = malloc(15 * sizeof(*ptr)); /* a block of 15 integers */
    if (ptr != NULL) {
      *(ptr + 5) = 480; /* assign 480 to sixth integer */
      printf("Value of the 6th integer is %d",*(ptr + 5));
    }
}

Popularity 10/10 Helpfulness 2/10 Language c

Source: www.guru99.com

Tags: c

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Contributed on Aug 28 2021

Dead Duck

0 Answers Avg Quality 2/10

malloc

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