#include <stdio.h>
#include <unistd.h> /* for sleep; may be different or unnecessary on your machine */
#define	N 80			/* length of line */

main()
{
	char line[N];		/* background, all blanks */
	int i;

	/* Initialize the array to all blanks, terminated with a '\0'. */
	for (i = 0; i < N - 1; ++i) {
		line[i] = ' ';
	}
	line[i] = '\0';				/* Put '\0' into line[N-1]. */

	for (i = 0; i < N - 3; ++i) {

		/* Erase the last char of the previous rocket, if there was one. */
		if (i > 0) {
			line[i-1] = ' ';
		}

		/* Draw the rocket. */
		line[i]   = '=';
		line[i+1] = '=';
		line[i+2] = '>';

		printf("%s\r", line);
		fflush(stdout);		/* Output the above characters immediately. */
		sleep(1);			/* for 1 second */
	}
}