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


#define A_MEGABYTE (1024 * 1024)

int main() {
    char *some_memory;
    size_t  size_to_allocate = A_MEGABYTE;    
    int  megs_obtained = 0;

    while (megs_obtained < 16) {
        some_memory = (char *)malloc(size_to_allocate);
        if (some_memory != NULL) {
            megs_obtained++;
            sprintf(some_memory, "Hello World");
            printf("%s - now allocated %d Megabytes\n", some_memory, megs_obtained);
        }
        else {
            exit(EXIT_FAILURE);
        }
    }
    exit(EXIT_SUCCESS);
}