dynamicMemoryAllocation.c

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

int main()
{
    int n = 1000, i, *ptr, sum = 0;

    ptr = (int*) calloc(n, sizeof(int));
    if(ptr == NULL)
    {
        printf("Error! memory not allocated.");
        exit(0);
    }

    for(i = 0; i < n; ++i)
    {
        *ptr++ = i * 655;
        sum += *(ptr + i);
    }

    free(ptr);

    // Get the number of elements for the array
    n = 10000;

    // Dynamically allocate memory using malloc()
    ptr = (int*)malloc(n * sizeof(int));

    // Check if the memory has been successfully
    // allocated by malloc or not
    if (ptr == NULL) {
        printf("Memory not allocated.\n");
        exit(0);
    }
    else {

        // Get the elements of the array
        for (i = 0; i < n; ++i) {
            ptr[i] = i + 30000;
        }

    }
    return 0;
}