Memory Allocation in C

This is a simple Memory Allocation example in C Language. In this example you can see the following point:

The functions for allocation of memory: malloc, relloc, and calloc.
The functions return the pointers to void, which can be typecast to any data type.
These functions take the input as the size of memory requirement.

#include <stdio.h>

#include <malloc.h>



main(){



    int *base;

    int i, j;

    int cnt = 0;

    int sum = 0;

    printf("Enter the integer number whatevere you want to store \n");

    scanf("%d", &cnt);

    base = (int *)malloc(cnt * sizeof(int));

    printf("the base of allocation is %16lu \n", base);

    if(!base)

        printf("unable to allocate size \n");

    else {

        for(j=0;j<cnt;j++)

           *(base+j)=5;

    }

    sum = 0;

    for(j=0;j<cnt;j++)

        sum = sum + *(base+j);

    printf("total sum is %d\n",sum);

    free(base);

    printf("the base of allocation is %16lu \n",base);

    base = (int *)malloc(cnt * sizeof(int));

    printf("the base of allocation is %16lu \n",base);

    base = (int *)malloc(cnt * sizeof(int));

    printf("the base of allocation is %16lu \n",base);

    base = (int *)calloc(10,2);

    printf("the base of allocation is %16lu \n",base);

}