The function malloc is used to allocate a certain amount of memory during the execution of a program. The malloc function will request a block of memory from the heap. If the request is granted, the operating system will reserve the requested amount of memory. When the amount of memory is not needed anymore, you must return it to the operating s…

malloc_demo.cpp

#include<stdio.h>
#include <cstdlib>

int main()
{
    int *ptr_one;

    ptr_one = (int *)malloc(sizeof(int));

    if (ptr_one == 0)
    {
        printf("ERROR: Out of memory\n");
        return 1;
    }

    *ptr_one = 25;
    printf("%d\n", *ptr_one);

    free(ptr_one);

    return 0;
}