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

int main()
{
	typedef struct {
		char *name;	/* name of the planet */
		double factor;	/* how many times stronger its gravity is than earth's */
	} planet_t;

	planet_t a[] = {
		{"Mercury",		 .27},
		{"Venus",		 .85},
		{"Earth",		1.00},
		{"Mars",			 .38},
		{"Jupiter",		2.33},
		{"Saturn",		 .92},
		{"Uranus",		 .85},
		{"Neptune",		1.12},
		{"Pluto",		 .44}
	};
#define N (sizeof a / sizeof a[0])		/* the number of planets */

	double weight;
	int i;
	planet_t *p;

	printf("Please type your weight: ");
	scanf("%lf", &weight);
	printf("On each planet, your weight would be\n");

	for (i = 0; i < N; ++i) {
		printf("%-11s %6.2f\n", a[i].name, weight * a[i].factor);
	}

	for (p = a; p < a + N; ++p) {
		printf("%-11s %6.2f\n", p->name, weight * p->factor);
	}

	return EXIT_SUCCESS;
}