Dynamic Memory Allocation

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

void swap(int *a, int *b);

int main()
{
    int *x, n, i;

    printf("How many numbers?\n");
    scanf("%d", &n);
    x = (int *)malloc(n*sizeof(int));

    for(i = 0; i < n; i++)
        scanf("%d", &x[i]);

    free(x);

    return 0;
}

void swap(int *a, int *b)
{
    int temp = *a;
    *a = *b;
    *b = temp;
}