mem.c

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

int main(int argc, char const *argv[])
{
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <MEM SIZE>\n", argv[0]);
        return 1;
    }

    printf("Allocating %s bytes of memory...\n", argv[1]);
    int size = atoi(argv[1]);
    char *mem = calloc(size, 1);
    printf("Allocated successfuly %p\n", mem);

    printf("Using that memory...\n");
    for (int i=0; i < size; i++)
        mem[i] = (i % 254) + 1;
    printf("Success.\n");

    printf("Freeing memory...\n");
    free(mem);
    printf("Success.\n");

    return 0;
}