/* Example: Better Naval Battle
	Author: Peter Brusilovsky */
	

#include <stdio.h>
#define FSIZE 5
#define SHIP 1
#define EMPTY 0
#define DESTROYED 2

static char battlefield[FSIZE][FSIZE] = {
 {1, 0, 1, 0, 0}, /* row A */
 {0, 0, 0, 0, 1}, /* row B */
 {0, 0, 1, 0, 0}, /* row C */
 {0, 0, 0, 0, 0}, /* row D */
 {1, 0, 0, 0, 1}, /* row E */
};

static char *picture[3] = {"   ", "[ ]", "[X]"};
void printfield(char *c);

int react(char c, int r);
/* legend: 0 empty, 1 ship, 2 destroyed ship */

main() 
{
	int col;
	char ch_row;
	
	printfield("Starting position");
	printf("Enter your move like 5 A\n");
	printf("Enter 0 X to exit\n");
	/* reads and process hits */
	do{
		printf("You move: ");
		scanf("%d %c", &col, &ch_row);
		
	} while(react(ch_row, col) > 0);
	printfield("Ending position");

	return 0;
}

int react(char r, int col) {
	int row;

		if (col == 0) {
			printf("Good Bye!\n");
			return 0;
		}
		row = r - 'A';
		if(row < 0 || row > 4) 
			printf("Row %c is not possible!\n", r);
		else if (col <1 || col >5)
			printf("Column %d is not possible!\n", col);
		else if (battlefield[row][col-1] == SHIP) {
			printf("Hit!\n");
			battlefield[row][col-1] = DESTROYED;
		} else if (battlefield[row][col-1] == DESTROYED) 
			printf("This ship has been already destroyed!\n");
		else 
			printf("Misss...\n");	
		return 1;		
}			
	
void printfield(char *header) 
{
	int i, j;
	/* print header */
	printf("%s\n\n   ", header);
	for(j = 0; j < FSIZE; ++j)
		printf(" %d  ", j+1);
	printf("\n");
	/* print field */	
	for(i = 0; i < FSIZE; ++i) {
		printf("%c  ", i + 'A');
		for(j = 0; j < FSIZE; ++j)
			printf("%s ", picture[ battlefield[i][j] ]);
		printf("\n");
	}
	printf("\n");
}