---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[])
{
char *input = malloc(20);
char *output = malloc(20);
strcpy(output, "normal output");
strcpy(input, argv[1]);
printf("input at %p %s\n", input, input);
printf("output at %p %s\n", output, output);
printf("\n%s\n", output);
}