1306.c

#include <stdio.h>
#include <ctype.h>

#define NUM_PLANETS 9

int string_equal(char *s, char *t);

int
main (int argc, char *argv[])
{
	char *planets[] = {"Mercury", "Venus", "Earth", 
					   "Mars", "Junipter", "Saturn",
					   "Uranus", "Nepture", "Pluto"};
					  
	int i, j;
	
	for (i = 1; i < argc; i++)
	{
		for (j = 0; j < NUM_PLANETS; j++)
		{
			if (string_equal(argv[i], planets[j]) == 0)
			{
				printf("%s is planet %d\n", argv[i], j + 1);
				break;
			}
		}
		if (j == NUM_PLANETS)
		{
			printf("%s is not the planet\n", argv[i]);
		}
	}
	return 0;
}

int 
string_equal(char *s, char *t)
{
	int i;
	
	for (i = 0; toupper(s[i]) == toupper(t[i]); i++)
	{
		if (s[i] == '\0')
		{			
			return 1;
		}
	}
	return 0;
}