C: Using malloc() For Dynamic Memory Allocation.
Video demonstration: https://youtu.be/DUt2YFVxk5g
https://github.com/pereiradaniel/c_programs/blob/master/dyn_mem/malloc/malloc.c
// Dynamic Memory Allocation - malloc
// ----------------------------------
// This program accepts user input to create a dynamic array of ints.
#include <stdio.h>
#include <stdlib.h> // malloc!
int main(int argc, char* argv[])
{
// Prompt user for number of ints for dynamic memory allocation:
int num_ints = 0;
printf("This program will dynamically allocate memory for an array of ints.\nHow many ints would you like? ");
scanf(" %d", &num_ints);
// Create a dynamically allocated array of integers using user input:
int *a = malloc(sizeof(int) * num_ints);
// Use for loop to assign values to the int array a.
for (int i=0; i<num_ints; ++i)
a[i] = i;
// Use for loop to print contents of array a.
for (int i=0; i<num_ints; ++i)
printf("a[%d] = %d\n", i, a[i]);
printf("\n"); // new line!
printf("a: %p\n", a); // Prints memory location of a.
free(a); // Deallocate memory!
return 0;
}==111== Memcheck, a memory error detector ==111== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==111== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info ==111== Command: ./a.out ==111== This program will dynamically allocate memory for an array of ints. How many ints would you like? 5 a[0] = 0 a[1] = 1 a[2] = 2 a[3] = 3 a[4] = 4 a: 0x4a4e8c0 ==111== ==111== HEAP SUMMARY: ==111== in use at exit: 0 bytes in 0 blocks ==111== total heap usage: 3 allocs, 3 frees, 2,068 bytes allocated ==111== ==111== All heap blocks were freed -- no leaks are possible ==111== ==111== For lists of detected and suppressed errors, rerun with: -s ==111== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
