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malloc basics

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Talented Tiger answered on March 3, 2020 Popularity 10/10 Helpfulness 3/10

answer malloc basics

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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 malloc

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Contributed on Feb 03 2022

Talented Tiger

0 Answers Avg Quality 2/10

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malloc in c

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#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 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

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

how to use malloc in c

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int* a =(int*)malloc(sizeof(int))

Popularity 10/10 Helpfulness 3/10 Language c

Source: Grepper

Tags: c

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Contributed on Sep 22 2020

Healthy Horse

0 Answers Avg Quality 2/10

malloc

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// 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

malloc

Comment

/*
 *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 mall

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Contributed on Jul 22 2022

Smoggy Sloth

0 Answers Avg Quality 2/10

malloc

Comment

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

char *create_array(unsigned int, char);

/**
 * main - check the code .
 *
 * Return: Always 0.
 */
int main(void)
{
	char *buffer;
	unsigned int size;

	size = 0;
	buffer = create_array(size, 'H');
	if (buffer == NULL)
	{
		printf("failed to allocate memory\n");
		return (1);
	}
	free(buffer);
	return (0);
}

Popularity 9/10 Helpfulness 2/10 Language c

Source: s3.amazonaws.com

Tags: c malloc mal

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Contributed on Oct 04 2022

Fine Ferret

0 Answers Avg Quality 2/10

what is the use of malloc in c

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In C, the library function malloc is used to allocate a block of memory on the heap. The program accesses this block of memory via a pointer that malloc returns. When the memory is no longer needed, the pointer is passed to free which deallocates the memory so that it can be used for other purposes.

Popularity 10/10 Helpfulness 2/10 Language c

Source: Grepper

Tags: c

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Contributed on Jul 08 2020

Wandering Weevil

0 Answers Avg Quality 2/10

Malloc

Comment

ptr = malloc(size); //You dont need to cast

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: malloc ma

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Contributed on Jun 18 2020

0 Answers Avg Quality 2/10

malloc basics

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